Improvements in Printing Telegraphs.
Year: 1898

page_text: Date of Application, 26th May, 1898
Complete Specification Left, 24th Feb., 1899-Accepted, 20th May, 1899
Improvements in Printing Telegraphs.
I, LEO KAMM, of 1, Laburnum Villas, Gresley Road, Hornsey Rise, in the
County of London, Electrician, do hereby declare the nature of this invention
to be as follows:-
My invention relates to printing telegraphs of the kind described in the
Specification of former Letters l'atent granted to me No. 3531 dated 19th February
1895 and it comprises the improvements hereinafter described whereby the
construction of such apparatus is greatly simplified and its efficiency at the same
time increased.
In the accompanying drawings,
Figure 1 is a plan view of my improved apparatus; and
Figure 2 is a sectional side elevation of the same;
Figure 3 is an elevation of some of the parts seen from the left hand side of
the machine; and
Figure 4 is a section on the line 4-4 Figure 3 looking in the direction of the
arrow 1 in the said figure:
Figure 5 is a section on the line 5-5 of Figure 3 looking in the direction of
the arrow 2 in the said figure:
Figure 6 is a section on the line 6-6 Figure 2 shewing certain parts:
Figure 7 is a central vertical section of certain parts of the mechanism shewn in
Figure 2 but drawn to a larger scale:
Figure 8 is a section on the line 8-8 Figure 7.
Figure 9 is a sectional elevation of a portion of the right hand side of Figure 1;
Figure 10 is an elevation drawn to an enlarged scale of part of the mechanism
shewn in Figure 6 looking in the direction of the arrow 1 in the said figure;
Figure 11 is a view of the parts shewn in Figure 10 looking in the direction of
the arrow and
:
Figure 12 is a plan view of the said parts:
Figure 13 is a sectional view of a detail hereinafter described drawn to an
enlarged scale; and
Figures 14 and 15 are respectively an elevation and plan of another detail also
drawn to an enlarged scale;
Figures 10, 17 and 18 are a front view, a side view and a section on the
line 18-18 Figure 16, looking in the direction of the arrow, of one of the magnets
of the apparatus and its armature:
Figures 19 and 20 are plan views illustrating details of the printing mechanism
the said views being drawn to the same scale as Figure 7:
Figure 21 is a view of part of Figure 3 looking in the direction of the arrow 3
in the said figure:
Figure 22 is a side elevation of a contact device hereinafter described; and
Figure 23 is a diagram illustrating the operation of the apparatus:
Figures 24 and 25 are respectively a front sectional elevation and a side
ΓΑ

page_text: sectional elevation of a counting device to be used in conjunction with my
apparatus;
a is the base-board of the apparatus and 6 is a metal plate attached thereto
and having fixed to it the two pillars or uprights united at their upper ends
by the cross-head.b².
c is the spindle carrying the synchronizing or trailing arm the said spindle
being mounted vertically between the plate band the cross-head 62 (as clearly
shewn in Figure 7) but insulated therefrom. At its lower end the said spindle is
represented as being provided with a pivot pin supported upon a screw c³
passed through an insulating bush inserted into the plate band at its upper
end held in position by a screw e also inserted through an insulating bush
the cross-head 62.
in
containing
The pivot pin c² of the said spindle is inserted into a metallic cup
mercury which surrounds the said pin and serves to form a good electrical
connection between the screw, to which one of the circuit wires is attached as
hereinafter described, and the said spindle c. The said cup is held in position
by the screw c³ and this arrangement permits of rotating the cup c independently
of the said screw so as to bring the top of the said cup into contact with the
bottom of the spindle c to lock the latter for transport purposes and at the same
time prevent the escape of mercury from the said cup.
d, d, Figures 1, 2 and 7, are the key levers which are mounted upon a rib d¹,
Figure 2, on the front edge of the plate b so as to radiate from the centre of
the said plate, each of the said levers being formed with a slot fitting onto a
pin projecting from the rib a plate being placed above the said levers
to hold them upon the pins. The inner end of each lever d is bifurcated and
has passing through and supported in it a pin d' the upper end of which when
its key is depressed is caused to project into the path of the trailing arm c¹ in the
manner described in the said former specification. The pins at their upper
ends are supported in a plate supported upon the disc by pillars do, do, the
pins being in electrical contact with the plates band. Each of the pins d'
is surrounded by a spring d. To permit of readily removing the said pins
and springs d from the plates band and levers d slots ds, Figures 1, 2, 6 and 7,
are formed in the plate instead of holes as in the former specification, the
pins being prevented from falling forward out of the said slots by collars
fitting on to the pins and normally held by the springs d in recesses on the
underside of the plate to remove any pin its spring is compressed so as to
allow the collar to fall out of its recess when the rod can be pulled forward at
its upper end and then lifted out from the lever d at its lower end.
The trailing arm c¹ which co-operates with the pins has at the end a fork-
shaped spring contact e, Figure 8, which when it strikes one of the stop pins <*
embraces the same and so ensures a good electrical contact.
f, Figures 1 and 9, is a weight for causing the rotation of the trailing arm c
when the latter is released, as hereinafter described, the said weight being
connected with the spindle c by the chain f¹ passing over a pulley fo. The said
weight is arranged to act as a plumb bob for indicating when the apparatus is
level and for this purpose it is provided at the bottom with a point or centre f
a corresponding point being arranged upon the base-board. In practice I
prefer to enclose the weight in a tube f and to provide the latter with a screw f
which permits of fixing the weight when it is desired to move or transport the
instrument.
g, Figure 1, is a frame which is pivoted at g₁, g¹ upon the base-board a and
which at its free end extends beneath all the key levers d, d in such a manner that
the depression of any one of the said levers causes the oscillation of the frame g.
The motion of this frame is utilized for releasing the trailing arm c¹ whenever
one of the keys d is depressed. To permit of this I provide the following arrange-
ment, that is to say, upon a plate 2 (Figures 3, 6, 10, 11 and 12) fixed to a
block of insulating material g3 which is itself fixed to the plate d³ over which the
5
5

page_text: trailing arm c¹ moves, I pivot a bell-crank lever carrying on one arm but
insulated therefrom a spring catch g5 which is adapted to engage with a bar g
on the trailing arm c¹ and adapted with the other arm to make electrical contact
with a contact piece 8 mounted upon a metallic plate g also fixed to the block g³ of
insulating material."
The contact piece 98 is mounted upon a pivot go and has at its free end an
adjusting screw this arrangement being provided to ensure a good contact being
made. 7, 12 are springs which act on the lever and the contact piece 98
respectively and serve to hold them against the stop pins g13, g13; g14, g14 are
pillars to which the said springs are connected at one end.
The lever g has fixed to it an arm h carrying an upright h¹ to which is
pivoted a pendulous arm h² carrying a trip piece ³ and in connection with this trip
piece is a lever h, Figures 3 and 6, pivoted upon a stud 0 on the pillars b' and
having at its free end a pin which is arranged in such relation to the said trip piece
that when the lever is turned upwards from the position shewn in Figure 3 it
will come in contact with the inclined or curved rear side of the said trip piece
and cause it to swing forwards the said trip piece after the pin has moved
above it falling back to its original position so that on the return or backward
movement of the said lever the pin by acting against the reverse side of the trip
piece to that which previously acted will force the said trip piece rearwardly at the
same time pushing back the arm hand moving the lever so as to disengage the
spring catch of the latter from the bar g of the trailing arm e¹ and at the same time
make contact between the said lever and the contact piece 98.
Movement is imparted to the arm + from the frame y through the medium of
the rod i pivoted at its lower end to a bracket on the frame g and at its upper end
provided with a projecting pin i¹, Figure 13, (which is a sectional elevation drawn
to a larger scale than Figure 3 of the upper end of the said rod i and the lever h
with which it co-operates) which engages with a lip or lug 2 upon the boss of the
lever in such a manner that as the frame is depressed the said pin will
pull down the lug 22 and so raise the lever in the manner hereinbefore described.
The rod has attached to it an extension piece carrying a roller adapted
as the rod is moved down to run upon the surface of a disc or cam 5 the said
roller and disc being arranged in such relation to each other that as the said rod i
is moved down the roller will run upon the surface of the disc and gradually
move back the upper end of the lever i so as to disengage the pin from the
lug the disengagement being completed just as the frame g reaches its lower-
most position. This arrangement ensures that as the frame g is depressed the
contact made between the lever g and the contact piece shall be only momentary
notwithstanding that the operator retains his finger upon one of the keys. 6 is a
spring which causes the return of the lever to its normal position after the
hook has been disengaged from it the said spring being at one end secured to a
lug upon the lever and at the other end to a pin upon the disc .
In order to prevent the momentum of the parts from moving the lever h
through too great an arc I attach to the said lever an arm 7 carrying a hook 28
designed when the limit of the movement of the lever h has been reached to
engage with a stop pin 10 is a weight which serves to assist the spring 26 in
retaining the parts in their normal position.
It will be noticed by reference to Figure 3 that the lever h is made adjustable
and that the connection between the rod i and the extension and its roller i
are also adjustable to permit of accurately adjusting the positions of the parts.
From the foregoing description it will be understood that on the depression
of one of the keys d the trailing arm c¹ is mechanically released and the electrical
contact which completes the line circuit made, the trailing arm after being
released moving over the plate d until it makes contact with the raised pin d
corresponding with the depressed key and so completes the local battery circuit.
In order to minimize as much as possible the blow which the end of the trailing
arm c¹ makes against such upraised pin under the action of the weight f the

page_text: governor or fly ; mounted on the spindle c which governor as shewn consists of
two weighted armis, Figures 2, 7 and 8, but which may be in the form of a
wheel or disc is connected to the said spindle frictionally so that it is free to rotate
under the action of its momentum after the trailing arm has come to rest. This
arrangement is clearly shewn in Figure 7 wherein the said governor is represented
as being provided on the underside with a spring j¹ which can be more or less
compressed by adjusting a collar j² upon the spindle c more or less towards or away
from a flange on the spindle.
The mechanism for releasing and stopping the trailing arm when the apparatus
is being used for receiving messages comprises the horn k, Figures 7 and 8,
pivoted to an upright on the extremity of the trailer arm c¹ the said horn being
made of tapering shape, as will be readily understood by reference to the detail
Figures 14 and 15, so that its free end will enter between any two of the projecting
pins d, and so that when so entered it will always bring the arm in a certain
position relatively with the said pins. The short arm of this horn is connected
by a rod with the free end of a lever pivoted at to a bracket on the
trailing arm c¹, in such a manner that as the said lever 14 is pulled towards the
spindle c, as hereinafter described, the bar go hereinbefore described and which is
attached to the rod will be moved so as to disengage it from the spring catch g5
on the lever g the horn k being at the same time caused to enter between two of
the pins d', d.
1, Figures 1, 2 and 6, is the electro-magnet through the medium of which this
movement of the horn and bar g is effected the said magnet being mounted upon
a frame secured to the plate b and having its armature 12 also pivoted to the said
frame. The free end of the armature 2 is connected by a cord or chain /³ with
the lever on the trailer, as shewn in Figure 7, the said cord passing around a
pulley carried on the frame and also around a grooved segment 15 on the
lever in such a manner that when the armature 12 is attracted the desired motion
will be imparted to the lever and consequently also to the connected parts.
It will be noticed by reference to Figure 7 that the spindle c is cut away on one
side and made hollow so as to permit of the axis of the spindle c forming
tangent with the peripheries of the pulley and segment 75 so that the cord shall
always run properly over the pulley and the segment in all positions of the
trailing arm c¹.
a
m, Figures 1, 2, 6, 16, 17 and 18, is the magnet for returning the trailing arm c¹
to its zero position after it has been operated and m¹ is the armature of this
magnet. This armature is mounted upon an arbor m² parallel with the bobbins,
as shewn in Figure 16, and is arranged relatively with the pole pieces of the
magnet, as clearly shewn in Figures 16, 17 and 18, so that when the armature
is attracted by the magnet it will cause the rotation of the shaft m³. The pole
pieces are notched to embrace the armature so as to form a large magnetic field. To
the said shaft m² is attached an arm m³ the free end of which has attached to it a
toothed segment m which engages with a pinion m5 on the spindle c. The said
segment and pinion are so geared together that when the trailing arm c' is in
its zero position the armature is in its nearest position to the pole pieces of the
magnet m. When, however, the said arm has been moved by the weight f and
stopped by a pin the magnet is energized to attract the armature whereby the
segment m will be moved to operate the trailing arm c¹ to return it to the zero
position.
The printing mechanism comprises a type sector n, Figures 1, 2, 8 and 19, having
upon it a series of spring bars nº carrying the types (shewn clearly in Figures 8
and 19) which sector is adapted to slide vertically upon the spindle e but caused to
rotate therewith by a pin 700 fixed to an arm upon the spindle c and passing through
a hole in the sector so that the sector rotates with the spindle to a greater or
less extent corresponding with the arc through which the trailing arm c¹ moves. 5
is the roller between which and the type wheel the paper strip to be printed
passes, the said roller being mounted in bearings on a frame n³ supported upon the

page_text: pillars 6, 6 and n" is the reciprocating plunger which serves to press one or the
other of the spring bars no towards the roller n¹ so as to impress the character
carried by the said bar upon the paper strip running over the said roller n¹. n is
a pressure roller which presses against the paper as it passes over the roller n¹.
The bars no of the type sector each carry two characters of type and in order to
provide for raising or lowering the sector to bring the desired character into
position for printing, I provide the following arrangement, that is to say, upon
a sleeve o carrying the type sector n on the spindle I arrange a roller-disc of as
shewn in Figures 1, 2, 8 and 19 and upon the bars, n, of the frame carrying the
plunger I arrange a block o² carrying two inclined planes 03, o grooved on their
faces as indicated by the dotted lines in Figure 7 and in Figure 20 (which is a
plan view shewing this arrangement) to receive the edge of the roller o¹.
The apparatus is provided with two finger keys d, the pins d, d of which are
adapted, when the keys are depressed, to stop the rotation of the sector n under
the action of the weight f so that the roller ol is opposite to one or the other of the
inclined planes o³, o. If when the roller is in the position indicated by the dotted
circle o in Figure 7, opposite the inclined plane 3 the plunger frame n5 is moved
inwards, the roller o will be caused to ride up the inclined plane o³ and so lift
the sleeve o to bring the lower row of types upon the sector in position for printing
whilst if when the roller o¹ is in its upper position, as indicated by the dotted
circle of in Figure 7, the plunger frame n³ is moved inwards, the inclined plane o*,
will press upon the roller and move down the sleeve o and the sector » so that the
upper row of types are in the same plane as the printing plunger. In order that
the sector shall remain in its upper or lower position I fix upon the spindle ca
spring bar o carrying a roller which lies in one of the two grooves 08, 08 which
correspond with the two positions of the sector. The rear end of the plunger
frame is carried by an arm 7 (Figure 7) on a rock-shaft p¹ and this rock-shaft
also carries an arm 2 from which a rod 73 extends to the ratchet mechanism for
rotating the roller n¹, the distance of a type character each time that the plunger is
reciprocated, the movement of the roller being effected during the backward
movement of the plunger n³.
The shaft p as shewn in Figure 3 receives its motion from the magnet g herein-
after referred to as the printing magnet through the pivoted armature q¹ of the
said magnet, a rod q², the lever arms 3, 4, Figures 1 and 3, pivoted on the stud hº,
the rod and the crank q6. The crank 96 is not fixed to the shaft 71 but has its
boss loosely mounted thereon and provided with a pin 98, Figure 1, which
co-operates with another pin 2 on a disc q10 fixed to the shaft p¹. This provision
of a break between the driving crank of and the shaft is to allow the printing
plunger n³ to move forward under the force of momentum and thereby press more
forcibly against the type of the printing sector than would be the case if its move-
ment was limited by the armature of the printing magnet q. A spring r, Figures 1
and 2, connected to a pin r¹ on the shaft p' and to an arm 2 on the cross-head 62,
serves to normally retain the pin 99 in contact with the pin 98.
s is the inking ribbon, Figures 1, 2, 3 and 21, which runs around two horizontal
pulleys, sl, s carried on the frame n². Rotary motion for causing the traverse
of the ribbon is imparted to one of the said pulleys from the shaft of the paper
roller n' through the medium of two gear wheels 2,3, the former of which is fixed
on the shaft of the roller n¹ whilst the latter is fixed on one end of a countershaft,
the other end of which carries a friction roller which engages with the under
face of one of the wheels s as clearly shewn in Figure 21. The roller s¹ against
which this friction wheel bears has pressing upon it a springs for holding the
said roller in frictional contact with the friction wheel st.
With the arrangement described each time that the paper roller n¹ is moved to
feed the paper after a character has been printed, the inking roller is also moved
a short distance to present a fresh surface.
The printing magnet q herein before described serves not only for operating the
printing plunger and the paper feeding mechanism, but also for operating a contact

page_text: device for transmitting a second current to the line and also a contact device for
completing the circuit of the local battery through the magnet m for returning
thet railing arm to zero, and to permit of accomplishing these functions the said
The
magnet has beside the armature gl, the armatures t. and pivoted arm u.
armature t is pivoted upon an axis arranged longitudinally between the coils of
the magnet g, as shewn in Figure, the said armature occupying a position
relatively with the pole pieces of the said magnet 7, as indicated by the dotted
lines in Figure 5, so that when the said magnet is energized the ends of the
armature will be attracted towards the pole pieces against the pressure of a
spring, Figure 5, the normal tendency of which is to retain the armature out of
contact with the pole pieces.
On the shaft t¹ is an insulated contact arm & Figures 1 and 5, which is arranged
to come into contact with a contact piece the said arm and contact t
being arranged in a shunt circuit from the main line circuit as will hereinafter
appear. By this arrangement when the magnet is energized, the arm comes
into contact with the piece and momentarily completes the circuit in the
desired manner.
The pivoted arm in connection with the printing magnet y for closing the
local battery circuit through the zero magnet m is pivoted at so that it lies
substantially parallel with the armature g' and in front of the same and is
designed to be operated by the said armature 9 by an arm 7º on the latter passing
behind and in contact with the arm u. This arm carries an arm u² having at the
end a disc provided with two pins u³, u.
v, Figures 1 and 3, is a pivoted arm or blade which forms part of the local
battery circuit and which must be either in contact with the contact piece v
which sends the local battery circuit through the printing magnet q or with the
contact piece which completes the battery circuit through the zero magnet m;
the arm has an extension against which a spring roller bears, the said
spring roller acting as a kind of cam which by bearing against the end of the
extension arm 3 ensures the arm being pressed against one or other of the contact
pieces, . The pins in connection with the arm are designed to act
upon the upper and undersides of the arm respectively and to shift the said arm v
in the required manner, that is to say, when the arm u is moved. When the
armature q' is attracted the pin 3 will move the blade so that it will be moved by
the roller into contact with the contact piece 2 whilst on the return movement
of the arm u under the action of a spring p (attached to the arm and a screw
in a pillar Figures 1 and 3) the pin will lift the blade so that it will make
contact with the contact piece v1.
The backward movement of the armature g is limited by a
stirrup attached to the frame of the magnet 7. Figures 1 and 3.
screw win a
In order to prevent the arm from shifting the arm out of contact with the
contact piece, which is in circuit with the zero magnet m until such time as the
zero magnet has brought the trailing arm back to the zero position, I attach to the
said arm ua laterally extending limba, Figures 3 and 6, having at its end a
projection carrying a pin 2.
On the underside of the insulating block g³ I mount a stop or catch lever a³,
Figures 3, 6, 10 and 11, having a shoulder which when the arm u is drawn
towards the magnet will engage with the pin and will hold the arm in this
position. The stop lever a is carried on one end of a shaft at the other end of
which carries an arm. This lever has affixed to it a pin and in the
block beneath the plate is pivoted a lever one end of which projects above
the plate in such a position that when the trailing arm c¹ is in its zero position it
will press against the said lever a whilst the other end of the said lever is arranged
as a cam surface which when the lever is struck by the trailing arm will act upon
the pin and so move the catch lever ³ to release the arm and allow it to be
pulled back by its spring u³.
In order that the magnet which receives, the impulses from the line for con-

page_text: trolling the movements of the trailing arm c¹ when the apparatus is being used
for receiving messages shall always be in position for operation and at the same
time be cut out of the line circuit when the apparatus is being used as a trans-
mitter I provide the switch arrangement shewn in Figures 1 and 22. This
switch is arranged in connection with one of the side bars of the frame g and
comprises the following elements, viz., a post y to which the main line circuit is
connected, a double contact lever y having two contact screws y, y inserted into
it, a contact piece y fixed upon but insulated from one of the side bars of the
frame g and connected with the magnet 7 and another contact piece y fixed to the
base-board a and connected with the main line circuit and with which the
screw is designed to make contact. A spring y6 arranged between the base-
board and an arm on the contact y' serves to maintain the contact.
With this arrangement the magnet is normally in the main line circuit through
the post y, the lever y', the screw y³ and the contact piece 4, when, however,
the frame g is depressed the screw y³ comes into contact with the piece y and at
the same time the contact piece y' is moved away from the screw 2 thus cutting
out the magnet l.
2, Figure 23, indicates the line battery and a local battery.
The operation of the apparatus hereinbefore described and the electrical con-
nections between the various parts of the apparatus will be understood by the
following description and by reference to Figure 23 which illustrates in diagram
two instruments which for convenience of description I will refer to as instrument I
which shall be the transmitting instrument and instrument 2 which shall be
the instrument in which the message is to be received, the corresponding parts in
both figures being represented by the same letters a mark thus however, being
appended to the letters of instrument 2 to distinguish them from the corresponding
parts in instrument 1.
Assume that an operator desires to transmit a message to instrument 2. As
now he depresses a key d he releases the trailing arm and at the same time makes
contact between the lever g and the contact piece 8, breaks the contact between
the parts y, y cutting out the magnet and makes contact between the parts y³, y².
The current from the battery then flows through the wire B, the lever g*, the
contact g, the wire C, the contact piece y', the screw y', the lever y¹ and the post y
to the line A thence through the post y*, the lever y¹*, the screw y2*, the contact
piece and strip **, the wire 1* to the magnet l*, thence through the wire E* to
the earth connection F* and thence to the earth connection F and back to the
battery z. The result of this impulse is that the trailing arm c* is released
owing to the armature 12* drawing back the bar g* on the trailing arm out of
engagement with the catch g*. At the same time that the said key d is
depressed, the trailing arm c¹ is also released and continues to move until it strikes
the raised pin corresponding with the depressed key. The moment this takes
place, the circuit of the local battery is completed the current from the said
battery flowing through the wire G to the spindle c, thence through the trailing
arm c, the upraised pin, the plate b and the wire H to the printing magnet g,
thence through the wire I, the contact, the blade v, the pillar carrying the said
blade and the wire J back to the battery .
The result of completing this local circuit is that the armature ql is attracted
to print on the paper band in transmitting instrument 1 and that at the same time
the armature is also attracted by the said magnet to make contact between the
arm 3 and the contact piece t so that a second impulse is sent from the battery z
through the wire B, the wire K, the arm 3, the screw t, the wire C and the
parts y, y³,y,y to the line A, and thence as before described to the magnet Z*
whereby the armature 12* is attracted and causes the projection of the horn k*
between two of the pins d** **.
As the horn k* is thus projected it completes the circuit of the local battery **
through the magnet q*, through exactly the same course as the circuit describe:1

page_text: for the battery through the magnet q, thereby operating the armature q* and
printing in instrument 2.
As the armature q¹ in each of the instruments is attracted towards its magnet q
it pulls after it the arm u so that the latter by means of the devices herein before
described moves the blade v to make contact with the screw 2, the said arm u
being retained in this position by the catch The local battery circuit in each
instrument now flows from the battery through the wires G, L to the zero
magnet m and thence through the wire M, the screw 2, the blade v, the post
carrying the said blade and the wire J back to the battery and thereby operating
the armature m' to return the trailing arm to its zero position. As the said trailing
arm reaches this position it strikes the lever to disengage the stop or catch
lever from the tooth or pin a² whereby the arm. is free to return to its normal
position under the action of the spring thereby returning the blade v to its
position in contact with the screw ¹.
It will be understood that the operation herein before described is performed each
time that a key is depressed and in operating the apparatus it is necessary after
the operator has depressed a key that he should retain it depressed until the
trailing arm has moved forward and again returned to the zero position.
I advantageously combine with my apparatus a counting mechanism for
indicating approximately the number of letters or characters transmitted by the
instrument to be recorded and consequently an approximation made of the number
of words transmitted. This counting mechanism is shewn in Figures 24 and 25
and in Figure 1 and is represented as being arranged in connection with the
pivoted frame g a pawl pivoted to the lever being arranged in connection with a
ratchet wheel upon the spindle carrying the counter discs. In the drawing the
counter is of the kind known as the Veeder" counter.
The counter has placed over it a casing designed to be secured by a pin
passing through the pillar of the counter which is attached to the base-board a.
This pin may be secured by a lead or other seal to prevent unauthorized access to
the counter and a glass is preferably placed in the top of the case to permit the
record of the counter to be read.
T
1000
G. F. REDFERN, & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.
Improvements in Printing Telegraphs.
I, LEO KAMM, of 1, Laburnum Villas, Gresley Road, Hornsey Rise, in the
County of London, Electrician, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:―
My invention relates to printing telegraphs of the kind described in the
Specification of former Letters Patent granted to me No. 3531 dated 19th February
1895 and it comprises the improvements hereinafter described whereby the
construction of such apparatus is greatly simplified and its efficiency at the same
time increased.
In the drawings accompanying my Provisional Specification,
Figure 1 is a plan view of my improved apparatus; and
Figure 2 is a sectional side elevation of the same;
Figure 3 is an elevation of some of the parts seen from the left hand side of
the machine; and

page_text: Figure 4 is a section on the line 4-4 Figure 3 looking in the direction of the
arrow 1 in the said figure:
Figure 5 is a section on the line 5-5 of Figure 3 looking in the direction of
the arrow 2 in the said figure:
Figure 6 is a section on the line 6-6 Figure 2 shewing certain parts:
Figure 7 is a central vertical section of certain parts of the mechanism shewn in
Figure 2 but drawn to a larger scale;
Figure 8 is a section on the line 8-8 Figure 7.
Figure 9 is a sectional elevation of a portion of the right hand side of Figure 1:
Figure 10 is an elevation drawn to an enlarged scale of part of the mechanism
shewn in Figure 6 looking in the direction of the arrow 1 in the said figure:
Figure 11 is a view of the parts shewn in Figure 10 looking in the direction of
the arrow and
Figure 12 is a plan view of the said parts:
Figure 13 is a sectional view of a detail hereinafter described drawn to an
enlarged scale; and
Figures 14 and 15 are respectively an elevation and plan of another detail also
drawn to an enlarged scale:
Figures 16, 17 and 18 are a front view, a side view and a section on the
line 18-18 Figure 16, looking in the direction of the arrow, of one of the magnets
of the apparatus and its armature:
Figures 19 and 20 are plan views illustrating details of the printing mechanism
the said views being drawn to the same scale as Figure 7:
Figure 21 is a view of part of Figure 3 looking in the direction of the arrow 3
in the said figure:
Figure 22 is a side elevation of a contact device hereinafter described and
Figure 23 is a diagram illustrating the operation of the apparatus:
Figures 24 and 25 are respectively a front sectional clevation and a side
sectional elevation of a counting device to be used in conjunction with my
apparatus:
is the base-board of the apparatus and is a metal plate attached thereto
and having fixed to it the two pillars or uprights united at their upper ends
by the cross-head b².
c is the spindle carrying the synchronizing or trailing arm c¹ the said spindle
being mounted vertically between the plate band the cross-head 62 (as clearly
shewn in Figure 7) but insulated therefrom. At its lower end the said spindle is
represented as being provided with a pivot pin supported upon a screw c³
passed through an insulating bush inserted into the plate band at its upper
end held in position by a screw also inserted through an insulating bush
the cross-head 62.
in
The pivot pin of the said spindle is inserted into a metallic cup ce containing
mercury which surrounds the said pin and serves to form a good electrical
connection between the screw c³, to which one of the circuit wires is attached as
hereinafter described, and the said spindle c. The said cup is held in position
by the screw and this arrangement permits of rotating the cup independently
of the said screw so as to bring the top of the said cup into contact with the
bottom of the spindle c to lock the latter for transport purposes and at the same
time prevent the escape of mercury from the said cup.
d, d, Figures 1, 2 and 7, are the key levers which are mounted upon a rib d¹,
Figure 2, on the front edge of the plate b so as to radiate from the centre of
the said plate, each of the said levers being formed with a slot fitting onto a
pin projecting from the rib a plate being placed above the said levers
to hold them upon the pins. The inner end of each lever is bifurcated and
has passing through and supported in it a pin d the upper end of which when
its key is depressed is caused to project into the path of the trailing arm. c¹ in the
manner described in the said former specification. The pins at their upper
ends are supported in a plate d supported upon the disc d by pillars do, do, the

page_text: pins d being in electrical contact with the plates b and d³. Each of the pins d
is surrounded by a spring d'. To permit of readily removing the said pins d
and springs from the plates b and d and levers d slots ds, Figures 1, 2, 6 and 7,
are formed in the plate instead of holes as in the former specification, the
pins being prevented from falling forward out of the said slots by collars &
fitting on to the pins and normally held by the springs din recesses on the
underside of the plate to remove any pin its spring is compressed so as to
allow the collar to fall out of its recess when the rod can be pulled forward at
its upper end and then lifted out from the lever d at its lower end.
The trailing arm c¹ which co-operates with the pins has at the end a fork-
shaped spring contact e, Figure 8, which when it strikes one of the stop pius dª
embraces the same and so ensures a good electrical contact.
f, Figures 1 and 9, is a weight for causing the rotation of the trailing arm c
when the latter is released, as hereinafter described, the said weight being
connected with the spindle c by the chain fl passing over a pulley fo. The said
weight is arranged to act as a plumb bob for indicating when the apparatus is
level and for this purpose it is provided at the bottom with a point or centre f
a corresponding point being arranged upon the base-board. In practice I
prefer to enclose the weight in a tube ft and to provide the latter with a screw f
which permits of fixing the weight when it is desired to move or transport the
instrument.
g, Figure 1, is a frame which is pivoted at g', g¹ upon the base-board a and
which at its free end extends beneath all the key levers d, d in such a manner that
the depression of any one of the said levers causes the oscillation of the frame g.
The motion of this frame is utilized for releasing the trailing arm c¹ whenever
one of the keys is depressed. To permit of this I provide the following arrange-
ment, that is to say, upon a plate g (Figures 3, 6, 10, 11 and 12) fixed to a
block of insulating material g3 which is itself fixed to the plate over which the
trailing arm c moves, I pivot a bell-crank lever carrying on one arm but
insulated therefrom a spring catch which is adapted to engage with a bar g6
on the trailing arm c¹ and adapted with the other arm to make electrical contact
with a contact piece s mounted upon a metallic plate 9 also fixed to the block g³ of
insulating material.
The contact piece 8 is mounted upon a pivot go and has at its free end an
adjusting screw this arrangement being provided to ensure a good contact being
made. g, gare springs which act on the lever g and the contact piece 98
respectively and serve to hold them against the stop pins g13, 13; 914, g14 are
pillars to which the said springs are connected at one end.
The lever has fixed to it an arm h carrying an upright h¹ to which is
pivoted a pendulous arm ² carrying a trip piece and in connection with this trip
piece is a lever h4, Figures 3 and 6, pivoted upon a stud h° on the pillars b¹ and
having at its free end a pin which is arranged in such relation to the said trip piece
that when the lever 4 is turned upwards from the position shewn in Figure 3 it
will come in contact with the inclined or curved rear side of the said trip piece
and cause it to swing forwards the said trip piece after the pin has moved
above it falling back to its original position so that on the return or backward
movement of the said lever the pin by acting against the reverse side of the trip
piece to that which previously acted will force the said trip piece rearwardly at the
same time pushing back the arm and moving the lever g so as to disengage the
spring catch of the latter from the bar g of the trailing arm e¹ and at the same time
make contact between the said lever and the contact piece 98.
Movement is imparted to the arm 4 from the frame g through the medium of
the rod i pivoted at its lower end to a bracket on the frame g and at its upper end
provided with a projecting pin 2, Figure 13, (which is a sectional elevation drawn
to a larger scale than Figure 3 of the upper end of the said rod i and the lever h
with which it co-operates) which engages with a lip or lugupon the boss of the
lever in such a manner that as the frame g is depressed the said pin ¹ will
pull down the lug and so raise the lever in the manner hereinbefore described.

page_text: The rod i has attached to it an extension piece carrying a roller + adapted
as the rod i is moved down to run upon the surface of a disc or cam 25 the said
roller and disc being arranged in such relation to each other that as the said rod i
is moved down the roller will run upon the surface of the disc and gradually
move back the upper end of the lever i so as to disengage the pin from the
lug the disengagement being completed just as the frame y reaches its lower-
most position. This arrangement ensures that as the frame g is depressed the
contact made between the lever g' and the contact piece 8 shall be only momentary
notwithstanding that the operator retains his finger upon one of the keys. 6 is a
spring which causes the return of the lever to its normal position after the
hook has been disengaged from it the said spring being at one end secured to a
lug upon the lever hand at the other end to a pin upon the disc ³.
In order to prevent the momentum of the parts from moving the lever h
through too great an arc I attach to the said lever an arm carrying a hook 28
designed when the limit of the movement of the lever h has been reached to
engage with a stop pin 2.0 is a weight which serves to assist the spring 6 in
retaining the parts in their normal position.
It will be noticed by reference to Figure 3 that the lever h is made adjustable
and that the connection between the rod i and the extension and its roller **
are also adjustable to permit of accurately adjusting the positions of the parts.
From the foregoing description it will be understood that on the depression
of one of the keys d the trailing arm c¹ is mechanically released and the electrical
contact which completes the line circuit made, the trailing arm after being
released moving over the plate until it makes contact with the raised pin d
corresponding with the depressed key and so completes the local battery circuit.
In order to minimize as much as possible the blow which the end of the trailing
arm makes against such upraised pin under the action of the weight f the
governor or fly mounted on the spindle c which governor as shewn consists of
two weighted arms, Figures 2, 7 and 8, but which may be in the form of a
wheel or disc is connected to the said spindle frictionally so that it is free to rotate
under the action of its momentum after the trailing arm has come to rest. This
arrangement is clearly shewn in Figure 7 wherein the said governor is represented
as being provided on the underside with a spring which can be more or less
compressed by adjusting a collar j2 upon the spindle more or less towards or away
from a flange on the spindle.
The mechanism for releasing and stopping the trailing arm when the apparatus
is being used for receiving messages comprises the horn k, Figures 7 and 8,
pivoted to an upright on the extremity of the trailer arm c the said horn being
made of tapering shape, as will be readily understood by reference to the detail
Figures 14 and 15, so that its free end will enter between any two of the projecting
pins d, and so that when so entered it will always bring the arm in a certain
position relatively with the said pins. The short arm of this horn is connected
by a rod with the free end of a lever pivoted at to a bracket on the
trailing arm c¹, in such a manner that as the said lever is pulled towards the
spindle c, as hereinafter described, the bar hereinbefore described and which is
attached to the rod will be moved so as to disengage it from the spring catch g³
on the lever g the horn k being at the same time caused to enter between two of
the pins d', d.
1, Figures 1, 2 and 6, is the electro-magnet through the medium of which this
movement of the horn and bar g is effected the said magnet being mounted upon
a frame secured to the plate b and having its armature 2 also pivoted to the said
frame. The free end of the armature is connected by a cord or chain 13 with
the lever on the trailer, as shewn in Figure 7, the said cord passing around a
pulley carried on the frame and also around a grooved segment 15 on the
lever in such a manner that when the armature 12 is attracted the desired motion
will be imparted to the lever and consequently also to the connected parts.

page_text: It will be noticed by reference to Figure 7 that the spindle c is cut away on one
side and made hollow so as to permit of the axis of the spindle c forming a
tangent with the peripheries of the pulley and segment 15 so that the cord shall
always run properly over the pulley and the segment in all positions of the
trailing arm c¹.
m, Figures 1, 2, 6, 16, 17 and 18, is the magnet for returning the trailing arm c
to its zero position after it has been operated and m' is the armature of this
magnet. This armature is mounted upon an arbor m² parallel with the bobbins,
as shewn in Figure 16, and is arranged relatively with the pole pieces of the
magnet, as clearly shewn in Figures 16, 17 and 18, so that when the armature
is attracted by the magnet it will cause the rotation of the shaft m². The pole
pieces are notched to embrace the armature so as to form a large magnetic field. To
the said shaft m² is attached an arm m³ the free end of which has attached to it a
toothed segment m which engages with a pinion on the spindle c. The said
segment and pinion are so geared together that when the trailing arm c¹ is in
its zero position the armature is in its nearest position to the pole pieces of the
magnet m. When, however, the said arm has been moved by the weight f and
stopped by a pin d the magnet is energized to attract the armature whereby the
segment m will be moved to operate the trailing arm to return it to the zero
position.
The printing mechanism comprises a type sector n, Figures 1, 2, 8 and 19, having
upon it a series of spring bars n carrying the types (shewn clearly in Figures 8
and 19) which sector is adapted to slide vertically upon the spindle c but caused to
rotate therewith by a pin no fixed to an arm upon the spindle c and passing through
a hole in the sector so that the sector rotates with the spindle to a greater or
less extent corresponding with the are through which the trailing arm moves.
n' is the roller between which and the type wheel the paper strip to be printed
passes, the said roller being mounted in bearings on a frame n² supported upon the
pillars 6, 6 and 3 is the reciprocating plunger which serves to press one or the
other of the spring bars ° towards the roller n¹ so as to impress the character
carried by the said bar upon the paper strip running over the said roller n¹. nt is
a pressure roller which presses against the paper as it passes over the roller n'.
The bars nº of the type sector each carry two characters of type and in order to
provide for raising or lowering the sector to bring the desired character into
position for printing, I provide the following arrangement, that is to say, upon
a sleeve o carrying the type sector on the spindle I arrange a roller-disc
shewn in Figures 1, 2, 8 and 19 and upon the bars n³, of the frame carrying the
plunger n I arrange a block o carrying two inclined planes o³, o grooved on their
faces as indicated by the dotted lines in Figure 7 and in Figure 20 (which is a
plan view shewing this arrangement) to receive the edge of the roller o'.
as
The apparatus is provided with two finger keys d, the pins d, d of which are
adapted, when the keys are depressed, to stop the rotation of the sector n under
the action of the weight f so that the roller ol is opposite to one or the other of the
inclined planes o³, o. If when the roller is in the position indicated by the dotted
circle o in Figure 7, opposite the inclined plane o³ the plunger frame n is moved
inwards, the roller o will be caused to ride up the inclined plane o³ and so lift
the sleeve o to bring the lower row of types upon the sector in position for printing
whilst if when the roller o' is in its upper position, as indicated by the dotted
circle of in Figure 7, the plunger frame n is moved inwards, the inclined plane o
will press upon the roller and move down the sleeve o and the sector n so that the
upper row of types are in the same plane as the printing plunger. In order that
the sector shall remain in its upper or lower position I fix upon the spindle ca
spring bar o carrying a roller which lies in one of the two grooves 08, 08 which
correspond with the two positions of the sector. The rear end of the plunger
frame is carried by an arm (Figure 7) on a rock-shaft p¹ and this rock-shaft
also carries an arm 72 from which a rod 23 extends to the ratchet mechanism for
rotating the roller n¹, the distance of a type character each time that the plunger is

page_text: reciprocated the movement of the roller being effected during the backward
movement of the plunger n³.
The shaft p' as shewn in Figure 3 receives its motion from the magnet q herein-
after referred to as the printing magnet through the pivoted armature q' of the
said magnet, a rod q, the lever arms q', qt, Figures 1 and 3, pivoted on the stud h°,
the rod and the crank q. The crank q is not fixed to the shaft p¹ but has its
boss loosely mounted thereon and provided with a pin 98, Figure 1, which
co-operates with another pin " on a dise q¹ fixed to the shatt p'. This provision
of a break between the driving crank and the shaft is to allow the printing
plunger to move forward under the force of momentum and thereby press more
forcibly against the type of the printing sector than would be the case if its move-
ment was limited by the armature of the printing magnet q. A spring r, Figures 1
and 2, connected to a pin on the shaft p¹ and to an arm on the cross-head 62,
serves to normally retain the pin q" in contact with the pin q³.
s is the inking ribbon, Figures 1, 2, 3 and 21, which runs around two horizontal
pulleys s, s carried on the frame n². Rotary motion for causing the traverse
of the ribbon is imparted to one of the said pulleys from the shaft of the paper
roller n' through the medium of two gear wheels,, the former of which is fixed
on the shaft of the roller n¹ whilst the latter is fixed on one end of a countershaft,
the other end of which carries a friction roller which engages with the under
face of one of the wheels s as clearly shewn in Figure 21. The roller s against
which this friction wheel bears has pressing upon it a spring for holding the
said roller in frictional contact with the friction wheel st.
With the arrangement described each time that the paper roller is moved to
feed the paper after a character has been printed, the inking roller is also moved
a short distance to present a fresh surface.
The
The printing magnet q hereinbefore described serves not only for operating the
printing plunger and the paper feeding mechanism, but also for operating a contact
device for transmitting a second current to the line and also a contact device for
completing the circuit of the local battery through the magnet m for returning
the trailing arm to zero, and to permit of accomplishing these functions the said
magnet has beside the armature g', the armatures and pivoted arm .
armature t is pivoted upon an axis arranged longitudinally between the coils of
the magnet, as shewn in Figure 3, the said armature occupying a position
relatively with the pole pieces of the said magnet q, as indicated by the dotted
lines in Figure 5, so that when the said magnet is energized the ends of the
armature will be attracted towards the pole pieces against the pressure of a
spring, Figure 5, the normal tendency of which is to retain the armature out of
contact with the pole pieces.
and contact t
On the shaft t¹ is an insulated contact arm 3, Figures 1 and 5, which is arranged
to come into contact with a contact piece the said arm
being arranged in a shunt circuit from the main line circuit as will hereinafter
appear. By this arrangement when the magnet q is energized, the arm
into contact with the piece and momentarily completes the circuit in the
desired manner.
comes
The pivoted arm in connection with the printing magnet for closing the
local battery circuit through the zero magnet m is pivoted at u so that it lies
substantially parallel with the armature q' and in front of the same and is
designed to be operated by the said armature by an arm go on the latter passing
behind and in contact with the arm u. This arm carries an arm u² having at the
end a disc provided with two pins u³, ut.
v, Figures 1 and 3, is a pivoted arm or blade which forms part of the local
battery circuit and which must be either in contact with the contact piece v¹
which sends the local battery circuit through the printing magnet q or with the
contact piece which completes the battery circuit through the zero magnet m;
the arm has an extension against which a spring roller bears, the said
spring roller acting as a kind of cam which by bearing against the end of the

page_text: extension arme ensures the arm being pressed against one or other of the contact
pieces, The pins 3, in connection with the arm ² are designed to act
upon the upper and undersides of the arm respectively and to shift the said arm v
in the required manner, that is to say, when the arm u is moved.
armature
the roller
of the arm
in a pillar
When the
is attracted the pin ³ will move the blade e so that it will be moved by
into contact with the contact piece 2 whilst on the return movement
under the action of a spring (attached to the arm u and a screw
Figures 1 and 3) the pin u will lift the blade so that it will make
contact with the contact piece v'.
The backward movement of the armature is limited by a screw win a
stirrup w attached to the frame of the magnet 7, Figures 1 and 3.
In order to prevent the arm a from shifting the arm out of contact with the
contact piece, which is in circuit with the zero magnet m until such time as the
zero magnet has brought the trailing arm back to the zero position, I attach to the
said arm a laterally extending limb, Figures 3 and 6, having at its end a
projection carrying a pin 2.
On the underside of the insulating block g³ I mount a stop or catch lever a³,
Figures 3, 6, 10 and 11, having a shoulder which when the arm u is drawn
towards the magnet q will engage with the pin and will hold the arm in this
position. The stop lever is carried on one end of a shaft at the other end of
which carries an arm. This lever has affixed to it a pin 6 and in the
block 3 beneath the plate d is pivoted a lever one end of which projects above
the plate in such a position that when the trailing arm is in its zero position it
will press against the said lever whilst the other end of the said lever is arranged
as a cam surface which when the lever is struck by the trailing arm will act upon
the pin and so move the catch lever to release the arm and allow it to be
pulled back by its spring .
This
In order that the magnet which receives the impulses from the line for con-
trolling the movements of the trailing arm c¹ when the apparatus is being used
for receiving messages shall always be in position for operation and at the same
time be cut out of the line circuit when the apparatus is being used as a trans-
mitter I provide the switch arrangement shewn in Figures 1 and 22.
switch is arranged in connection with one of the side bars of the frame g and
comprises the following elements, viz. a post y to which the main line circuit is
connected, a double contact lever y¹ having two contact screws y², y³ inserted into
it, a contact piece y fixed upon but insulated from one of the side bars of the
frame g and connected with the magnet and another contact piece y fixed to the
base-board a and connected with the main line circuit and with which the
screw, is designed to make contact. A spring y arranged between the base-
board and an arm on the contact y' serves to maintain the contact.
With this arrangement the magnet 7 is normally in the main line circuit through
the post y, the lever y¹, the screw y² and the contact piece y, when, however,
the frame g is depressed the screw comes into contact with the piece y³ and at
the same time the contact piece y is moved away from the screw 2 thus cutting
out the magnet l.
2, Figure 23, indicates the line battery and 21 a local battery.
The operation of the apparatus hereinbefore described and the electrical con-
nections between the various parts of the apparatus will be understood by the
following description and by reference to Figure 23 which illustrates in diagram
two instruments which for convenience of description I will refer to as instrument 1
which shall be the transmitting instrument and instrument 2 which shall be
the instrument in which the message is to be received, the corresponding parts in
both figures being represented by the same letters a mark thus however, being
appended to the letters of instrument 2 to distinguish them from the corresponding
parts in instrument 1.
Assume that an operator desires to transmit a message to instrument 2. As
now he depresses a key d he releases the trailing arm c¹ and at the same time makes

page_text: contact between the lever 9 and the contact piece 98, breaks the contact between
the parts y, y cutting out the magnet and makes contact between the parts y³, y³.
The current from the battery then flows through the wire B, the lever, the
contact g, the wire C, the contact piece y³, the screw y³. the lever y₁ and the post y
to the line A thence through the post y*, the lever y*, the screw 2*, the contact
piece and strip y**, and the wire I* to the magnet * thence through the wire E* to
the earth connection F* and thence to the earth connection F and back to the
battery 2. The result of this impulse is that the trailing arm c¹* is released
owing to the armature 12* drawing back the bar * on the trailing arm out of
engagement with the catch g5*. At the same time that the said key d is
depressed, the trailing arm c¹ is also released and continues to move until it strikes
the raised pin d corresponding with the depressed key. The moment this takes
place, the circuit of the local battery is completed the current from the said
battery flowing through the wire G to the spindle c, thence through the trailing
arm c, the upraised pin , the plate 6 and the wire H to the printing magnet
thence through the wire I, the contact ¹, the blade, the pillar carrying the said
blade and the wire J back to the battery z¹.
The result of completing this local circuit is that the armature gl is attracted
to print on the paper band in transmitting instrument 1 and that at the same time
the armature is also attracted by the said magnet to make contact between the
arm and the contact piece t so that a second impulse is sent from the battery =
through the wire B, the wire K, the arm 3, the screw #, the wire C and the
parts y, y, y, y to the line A, and thence as before described to the magnet /*
whereby the armature 12* is attracted and causes the projection of the horn k*
between two of the pins 4* 74*.
As the horn * is thus projected it completes the circuit of the local battery *1*
through the magnet q*, through exactly the same course as the circuit describe 1
for the battery through the magnet q, thereby operating the armature q1* and
printing in instrument 2.
As the armature g¹ in each of the instruments is attracted towards its magnet q
it pulls after it the arm u so that the latter by means of the devices herein before
described moves the blade v to make contact with the screw, the said arm u
being retained in this position by the catch 3. The local battery circuit in each
instrument now flows from the battery through the wires G. L to the zero
magnet m and thence through the wire M, the screw 2, the blade , the post
carrying the said blade and the wire J back to the battery thereby operating
the armature m¹ to return the trailing arm to its zero position. As the said trailing
arm reaches this position it strikes the lever x to disengage the stop or catch
lever from the tooth or pin 2 whereby the arm is free to return to its normal
position under the action of the spring 5 thereby returning the blade v to its
position in contact with the screw v¹.
It will be understood that the operation herein before described is performed each
time that a key is depressed and in operating the apparatus it is necessary after
the operator has depressed a key that he should retain it depressed until the
trailing arm has moved forward and again returned to the zero position.
I advantageously combine, with my apparatus a counting mechanism for
indicating approximately the number of letters or characters transmitted by the
instrument to be recorded and consequently an approximation made of the number
of words transmitted. This counting mechanism is shewn in Figures 24 and 25
and in Figure 1 and is represented as being arranged in connection with the
pivoted frame g a pawl pivoted to the lever being arranged in connection with a
ratchet wheel upon the spindle carrying the counter discs. In the drawing the
counter is of the kind known as the Veeder" counter.
66
The counter has placed over it a casing designed to be secured by a pin
passing through the pillar of the counter which is attached to the base-board a.
This pin may be secured by a lead or other seal to prevent unauthorized access to

page_text: the counter and a glass is preferably placed in the top of the case to permit the
record of the counter to be read.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. In a printing telegraph the combination with a trailing arm and a printing
sector moving with the said arm and mounted on a spindle, of a hook or catch for
retaining the said arm in its zero position, a lever carrying the said catch on one end
and having the other end adapted for completing an electrical circuit, a frame
operated by the depression of the key-levers and means for connecting the said
frame with the said lever so arranged that when one of the key levers is depressed
the said lever will be operated to release the trailing arm and to complete the
electrical circuit, substantially as described.
2. In a printing telegraph having a trailing arm adapted to be held in its zero
position by a catch which is mechanically moved by the depression of the key levers
and working in connection with a series of pins projecting from the key levers
and through a guiding plate (), collars (4) fitting on the said pins and in
recesses on the underside of the guide plate, springs for holding the said collars
in position and slots formed in the guide plate for permitting the removal of the
pins, substantially as described.
3. In a printing telegraph having a traiting arm working in connection with a
series of stop pins and adapted to be mechanically released from its zero position
by the depression of the key levers, a double spring contact upon the extremity
of the said trailing arm for engaging with the said pins, substantially as
described.
4. In a printing telegraph having a trailing arm mechanically released by the
depression of the key levers and working in connection with a series of pins
attached to the key levers and operated by a chain and weight, a fly or governor
frictionally connected with the shaft carrying the said trailing arm, substantially as
described.
5. In a printing telegraph having a trailing arm mounted upon a spindle which
spindle also carries a type sector and is operated by a chain and weight and
released mechanically by the operation of the key levers, a mercury cup arranged
at the bottom of the said spindle for affording a good electrical contact with the
said spindle, substantially as described.
6. In a printing telegraph having a trailing arm working in connection with a
series of stop pins and adapted to be mechanically released by the operation
of the key levers, a horn pivoted upon the end of the trailing arm and adapted
to be projected between the pins to ensure that when the trailing arm is locked
by the said horn the corresponding type upon the printing sector will be in position
for printing, substantially as described.
7. In a printing telegraph having a trailing arm mechanically released by the
operation of the key levers and having at its free end a pivoted horn of the kind
referred to in the preceding claiming clause, an operating magnet and a cord or
the like for communicating the motion of the armature of the said magnet to
the pivoted horn the said cord passing through the axis of the spindle carrying the
trailing arm, substantially as described.
8. In a printing telegraph wherein a trailing arm is normally held against
movement by a catch adapted to be automatically disengaged to release the arm,
an electro-magnet for returning the said arm to its zero position the armature of
which is mounted on a rotary axis between the pole pieces of the magnet.
substantially as described.
9. In a printing telegraph having a trailing arm mounted upon a rotary shaft
and adapted to be mechanically released from its zero position by the depression
of the key levers, a printing sector mounted upon the said shaft and provided with

page_text: a roller co-operating with two inclines adapted to be pushed against the roller
for the purpose of raising and lowering the same, substantially as described.
10. In a printing telegraph having a trailing arm mounted upon a rotary shaft
and adapted to be released from its zero position mechanically by the depression
of the key levers, the combination with the said trailing arm of a printing sector
having spring bars carrying the types to be printed and a type plunger adapted to
be reciprocated in guides to press the bars of the type sector, the said plunger
being connected with its operating shaft in such a manner that it is free to move
after the shaft comes to rest, substantially as described.
11. In a printing telegraph the combination of a trailing arm mounted on a
shaft, a catch for retaining the said arm in its zero position, means for disengaging
the catch from the trailing arm when one of the key levers is depressed, a type sector
mounted upon the said shaft and rotating therewith, a roller over which the
paper strip to be printed passes and an inking tape arranged to move between the
said roller and the printing sector the said tape being endless and running over
two rollers one of which is frictionally driven for the purpose of imparting motion
to the said ribbon, substantially as described.
a
arm,
axis and
12. In a printing telegraph the combination of a trailing arm mounted upon
a shaft, a catch which normally retains the said trailing arm in its zero position,
means whereby the depression of the key levers causes the disengagement of the
trailing arm, a horn on the trailing arm for engaging with a series of stop pins, a
magnet the armature of which is connected
said
with the
horn by
cord
of
passing through the axis the spindle of the trailing
ap
a second magnet having its armature rotating upon
adapted to return the trailing arm to its zero position and a third magnet
having two armatures and an arm moved by one of the said armatures the motion
of one of which armatures is utilized for operating the printing mechanism and
the motion of the second of which is utilized for operating the contact for closing
the line circuit whilst the motion of the arm is utilized for operating another contact
device for the purpose of switching out the said third magnet from the battery
circuit and introducing the second magnet having the rotating armature,
substantially as described.
13. In a printing telegraph wherein a trailing arm is connected to a rotary
shaft and wherein a catch normally holds the trailing arm in its zero position which
catch is mechanically operated to release the arm by the depression of the key
levers, a pivoted frame extending beneath all the kev levers and adapted to be
moved when any one of them is depressed, the said pivoted frame carrying a switch-
ing device having two pairs of contacts the said contacts being so arranged that
when the said frame is in its normal position a magnet in a shunt circuit of the
main line is in the circuit whilst when the said frame is in its other position
the said magnet is cut out of the main line circuit, substantially as described.
Dated the 24th day of February 1899.
G. F. REDFERN, & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.