IMPROVEMENTS IN TRANSMITTERS FOR PRINTING TELEGRAPHS
Year: 1883

page_text: LETTERS PATENT to Herbert John Allison, of the firm of Allison Brothers,
"
Patent Agents, Southampton Buildings, London, for an Invention of
"IMPROVEMENTS IN TRANSMITTERS FOR PRINTING TELEGRAPHS' commu-
nicated to him from abroad by Stephen Dudley Field, of the City and State
of New York. United States of America.
PROVISIONAL SPECIFICATION left by the said Herbert John Allison at
the Office of the Commissioners of Patents on the 18th December 1883.
HERBERT JOHN ALLISON, of the firm of Allison Brothers, Patent Agents,
Southampton Buildings, LondoD, "IMPROVEMENTS IN TRANSMITTERS FOR PRINTING
TELEGRAPHS a communication to me from abroad by Stephen Dudley Field, of
the City and State of New York, United States of America,
In this Invention I propose to furnish, first, a transmitter controlling a single
circuit which may embrace however a number of instruments; and secondly, a
transmitter capable of controlling a large number of circuits, each of which may
control a large number of instruments.
As to the first part of the invention I may remark that in operating the
ordinary printing telegraphs, it is well known that in order to attain the highest
speed an instrument is capable of, the printing should be effected by as momentary
a current as will charge the printing magnet and the printing armature should
leave the magnet promptly upon the cessation of the current, so that the platen or
press may be immediately withdrawn from the type wheel and not impede its
revolution.
In single line printing telegraphs this immediate movement of the platen away
from the wheel is secured by the very conditions of the instrument, as in such the
printing is ordinarily effected by an abnormal condition of current, an increase or
reversal for instance, and the abnormal condition immediately changed to the
normal condition.
In two line printers as hitherto constructed and arranged, it has not been
possible to effect the printing by what may be termed a mere momentary flash of

page_text: current. The result has been therefore that the printing armature has clung or
stuck to its magnet longer than necessary for the accomplishment of the printing,
thereby delaying the positioning of the type wheel or type wheels for the next
printing.
This I remedy by providing means in the transmitter controlling a two wheel
printer or a series thereof, for controlling the type wheel magnets, and for
automatically throwing into the printing circuit a flash of current effecting the
printing, the circuit of which is immediately and automatically broken.
In doing this I use an ordinary transmitter having an arm attached to the shaft
of an escape wheel, driven by any suitable power, and sending into the main
circuit so long as in motion the pulsations for controlling the magnets operating
the type wheels. These pulsations may be intermittent of one polarity, or they
may be reversals of polarity.
A range of keys is provided, normally out of the path of the rotating arm, but
adapted to be placed in its path and thereby arrest its motion, stopping the
pulsations of whatever character used, holding consequently the type wheel
positioned by the last impulse for the act of printing.
The printing circuit is controlled by a local relay circuit controlled in turn by
this transmitter.
The local relay circuit embraces local re-lay battery, one pole of which is
connected to the rotating arm of the transmitter, and the other to the range of
keys before noted, and two relay magnets, the first closing the main printing
circuit, the second closing a shunt of the local relay circuit around the first relay.
The result of this is that whenever the rotation of the arm is stopped by the
depression of a key, the local circuit is immediately closed, the first relay closing
the main printing circuit and throwing the printing current to line, the second
relay however at the same instant closes the local shunt around the first relay,
which is thereby rendered inactive, its armature falling away and breaking the
main printing circuit. Thus no matter what delay or stoppage of the rotating
arm or what may be the slowness of the operators, the printing circuit is closed
but momentarily, the least possible interval of time necessary to effect the printing,
and the printing magnets are charged so briefly that they readily discharge and do
not delay the operations of the escapement magnets.
In the second part of my invention, I propose to furnish a rapidly and easily
manipulated transmitter capable of controlling a large number of printing telegraph
circuits, each of which may in turn contain a large number of printing telegraphs,
and which in addition shall automatically control the circuit or circuits for
positioning the type wheel and the circuit or circuits for effecting the printing.
Preferably I propose to use this transmitter with a two wheel and a two line
printer, although as hereinafter set forth, it may be used with a one wheel printer
and with a one line printer.
The key board has a box like frame made for insulating material, upon the top
of which are two ranges of keys, one for one type wheel, the second for the other
type wheel.
Preferably for ease of manipulation these are arranged in two
concentric circles. These keys consist simply of sbanks and heads, a spring taking
under each head to hold the key normally up to its upward limit of motion.
One of the ranges of keys, say N° 1, passes through a strip of conducting metal
let into or fixed upon the top of the key board frame and connected to one of the
circuits to be hereinafter described, so that all the keys of such range are in
electrical connection with such circuit, the other or range No 2 passes directly
through the top of the key board frame and hence is insulated from range N° 1.
Within the key board box and slightly below the normal position of the ends of
the keys, is fixed an insulating strip, corresponding in forin to the form of the
ranges of keys. Upon one part thereof underneath the second range of keys is a
conducting strip connected in circuit as hereinafter described.
.
Affixed to the under part of this insulating strip is a series of metallic springs,
equal in number to the number of keys in either range. The ends of each spring

page_text: are bent up, around and over the insulating strip so that the free ends of each
spring rest underneath two keys, one end under one key in the first range, the
other end under the corresponding key in the second range.
The ends of the keys in this second range are tipped with insulation, their
function, on depression, being to force the ends of the springs underneath them
into connection with the metal springs on the insulating strip within the key board
box while the first range, on depression forms connection directly between the
strip on the key board through which they pass and the springs beneath them.
Each of these springs is connected to a segment of a disk. This disk is made of
insulating material, having upon it but insulated from each other a set of segments
equal in number to the number of springs.
This disk is sleeve mounted upon the main shaft and fastened so that this main
shaft may rotate while the disk remains stationary.
This main shaft is divided into two parts united by a clutch. Upon one of the
parts is fixed a pulley or other means for communicating motion thereto, and if
desired, a fly or balance wheel, while upon the other part is mounted a rotating
arm and a gear wheel to be hereafter described.
The clutch referred to is such a one that the two parts of the shaft shall revolve
as one, unless the movement of the part containing the arm and gear wheel be
impeded by some positive stop.
This clutch therefore may be any effective kind of friction or of magnetic
clutch.
For throwing pulsations or reversals upon the line one or a number of cylinders
of insulating surface may be used, each mounted upon its own shaft, supported in
suitable bearings and upon which cylinders proper metallic spaces are placed with
metallic fingers connected to the line and battery, thereon as hereinafter described.
Upon the shaft of each of these cylinders is a pinion or gear meshing into the
gear wheel on the main shaft, so that all are rotated thereby. Upon each cylinder
is arranged a series of metallic contact plates, one series for each line or circuit to
be controlled by the cylinder. When the transmitter is to be used for simple make
and break pulsations, these plates are simple rectangles on which contact two fingers,
one connected to the line, one to the battery.
-
When reversed currents are to be transmitted these plates are of zig-zag shape
and three fingers bear thereon, the outer fingers being connected respectively to
the + and poles of a divided battery, while the centre finger is connected to the
line.
Each series of these plates consists of a number arranged in the same diametrical
plane around the cylinder and a corresponding number of series of contact fingers
may be used.
The number of such plates in each series and the relation of the teeth in the gear
of the cylinders upon the shaft and in the gear upon the main shaft should be so
adjusted that during one revolution of a cylinder a number of pulsations equal to
the number of keys in each range should be thrown upon the line.
Upon the shaft of one of the cylinders is fixed a stop ratchet having teeth
corresponding in number to the number of contact plates in any one series.
Operating upon this is a stop pawl controlled by a magnet, and arranged, when
stopping this cylinder and consequently all deriving motion from the same prime
motor, to stop them with the contact fingers upon the metal plates.
This stop magnet is controlled by a circuit as follows: The arm referred to as on
the main shaft sweeps over the segments of the disk mentioned, each segment being
connected to one of the springs underneath the keys. This shaft arm is connected
in the circuit of a source of electricity, which circuit also passes by two branches,
to the metal strips in the key board and by the springs in the key board box and
by the segments.
There are then two breaks in this circuit, one at the key board, one at the disk.
If now a key be depressed, one break is closed, as the rotating arm passes over the
segment connected thereto, the other break is closed, and the circuit is complete,

page_text: causing the stop magnet to attract its armature carrying the stop pawl and stop the
revolution of the arm and the cylinders.
In some forms of printers it is desirable that two strengths of current should be
used. To enable this to be done is the use of the two branches of the circuit
before referred to.
At the transmitting station in each line circuit is placed a resistance, whose
cutting in or out of circuit shall make the necessary variations in the effective
strength of the current upon the line. In each circuit is arranged a shunt around
its resistance controlled by a relay magnet which is in a branch circuit from the
source of electricity; this branch circuit connecting to the metal strip in the
insulating piece beneath range of keys N° 2. If it be desired to normally have the
resistance out of circuit, the shunt circuit is completed through the front stop of
the relay magnet, but if normally to be in circuit the reverse connection will be
made. Then if one of the second range of keys be depressed it completes circuit
not only through the stop magnet but also through the relay magnet so as to
control the opening or closing of the shunt and leave in or out of the main circuit
the resistance.
The other branch, leading to the strip with which range 1 is connected, passes
directly back to the source of electricity, always leaving the line in its normal
condition.
In order to control the printing circuit or circuits, there is placed upon the end
of the shaft of a cylinder or of as many of the cylinders as may be desired, a wheel
having ratchet shaped teeth, a pawl taking therein on one side to prevent retrograde
motion.
A key is so arranged that it shall be lifted from its anvil by the impingement of
a bent end upon the higher part of the teeth but shall contact upon its anvil when
its bent end falls into the space between the teeth, permitting the key to contact
with its anvil, and close directly, or through the medium of a relay or relays, the
printing circuit.
While the cylinder is in rotation, this key is consequently kept away from its
anvil or at most allowed to touch it only so slightly or so briefly that the printing
circuit does not become energized, but when the cylinder comes to rest, the key
automatically closes the printing circuit.
In order to at any time repeat the printing of a letter without re-positioning the
type wheels, a key is introduced in the printing circuit by which it may be broken
and made irrespective of and while the transmitter is at rest.
By the constructions and arrangements herein indicated I am enabled to make a
transmitter, very rapid and certain in its operation, the slightest manipulation of
the keys sufficing to stop the type wheels at the proper position and the printing
being immediately and automatically accomplished.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by.
the said Herbert John Allison in the Patent Office on the 18th June 1884.
HERBERT JOHN ALLISON, of the firm of Allison Brothers, Patent Agents,
Southampton Buildings, London, "IMPROVEMENTS IN TRANSMITTERS FOR PRINTING
TELEGRAPHS," a communication to me from abroad by Stephen Dudley Field, of
the City and State of New York, United States of America,
In this invention I propose to furnish first a transmitter controlling a single
circuit which may embrace however a number of instruments; and secondly, a
transmitter capable of controlling a large number of circuits, each of which may
control a large number or series of instruments.
Means for carrying my invention into effect are fully shown in the drawings, in
which Figure 1 is a view mainly diagrammatic of a transmitting apparatus and
appliances for controlling a single circuit, while Figure 2 is a view of a transmitting
apparatus partly in plan and partly in section, with appropriate circuit connections
for controlling a large number of circuits simultaneously.
Figures 3, 4, 5, and 6 show details involved in the invention.
-
In figure 1, Tr is the transmitter, having one or more ranges of finger-keys, A, B,
C, D, arranged on depression to project into the path of and stop an arm F, on the
axis of the escape wheel E, driven by any suitable motor, and rocking or operating
the anchor P, which is the lever-key of a reverser, Rv Rv¹, one side of which is
connected to the + pole of any source of current, say a battery, E B, the other side
being connected to the pole, while the anchor is connected to the ground Gr.
While bere shown as a reversing transmitter, it is evident that a transmitter
sending currents of one polarity only might be used. So long as F is permitted to
rotate it follows that pulsations, either intermittent or reversed, will be sent over
the line 11 to the escapement magnets E M of a printing telegraph, causing such
magnets to control and position any suitable type-wheel or type-wheels. Of this
printing telegraph, P M are the printing magnets in the circuit of a source of
current P B, controlled, as shown, by a relay magnet, R., which is in a local
circuit, 34, having a local battery L B. One end of this local circuit goes to the
axis of the arm F, while the other, after passing through the relays R R',
connected to all the keys, as shown by the dotted line 4. If, now, F be stopped
by any of the keys, owing to its depression, the local circuit 34 will be closed, the
armature lever of R attracted, and the main printing circuit closed, the magnet P M
being arranged to operate, and that immediately, upon the first flash of current.
If, however, the operator be tardy or slow, this closure is prolonged, and P M
becomes so highly charged that it takes an appreciable interval for it to discharge
and allow its armature to be retracted, the rotation of the type-wheels would be
interfered with.
is
To guard against such prolonged closure of the printing circuit, a second
relay, R¹, is placed in the local circuit 34. The armature lever 7 and front stop of
this relay control a shunt circuit around the relay R, practically cutting it out of
circuit. Whenever, now, the local circuit 34 is closed, the armature lever r of R
closes the main printing circuit, at the same moment ' closes the shunt around R,
whose armature lever immediately falls away. Thus, no matter how long the local
circuit may be closed by the contact of F and a key, the printing circuit is only
momentarily closed and a single flash transmitted to effect the printing, the
printing magnets P M hence never becoming overcharged or needing time for
discharge.
In the remaining figures G G is the main driving shaft divided into the parts G
and G¹ connected by the clutch C¹, here shown as a friction clutch, but which may,

page_text: be a magnetic or any other form of clutch adapted to cause the two parts of the
shaft to rotate together unless an impediment or stop be brought to bear upon one
of them. This shaft is supported in suitable bearings B¹ B¹. Upon the part G¹ is
fixed a pulley over which passes the belt B11 by which motion is communicated to
it, although any other suitable device for communicating motion may be used.
A fly or balance wheel G may be used to give regularity of motion.
Upon the part G is rigidly mounted the arm I and the gear wheel K, the latter
meshing into and communicating motion to the gears k k'.
The arm may be provided at one end with an extension and handle i by which
it may be rotated by hand. At its other end a curved spring arm J, terminating
in a contact b is formed and placed so as to sweep over a disk H, which is hollowed
so that G may be rotated therein as in a sleeve, H being fastened by insulating
supports to one of the bearings B¹.
The gears ar mounted on shafts n n¹ supported in bearings 6¹ b¹. Upon
these shafts are the cylinders N. N¹. While two only are shown any desired
number may be used, the number being limited by the relative sizes of K, k k¹
and N N.
Upon each of these cylinders whose surface is of insulating material are mounted
one or more series of metallic contact plates, o o, five being shown, each series
being composed of a number arranged in the same circumferential plane around
the cylinder.
When intended to send reversed or alternating currents over a line, these
plates are of zig-zag shape as shown, that is the two extremities are in different
planes longitudinally, the extremities being connected by a metallic part lying in
both planes.
-
For each series of these plates longitudinally there are three fingers u, v, x, which
normally bear upon the surface of the cylinder, the two outer fingers contacting
with the extremity of a plate while the centre one contacts with the centre of the
plate. The two outer fingers are connected to the + and poles respectively
of a divided battery having a central ground connection, while the centre finger
is connected to the line. It will be readily understood from this that as a plate
passes under the fingers two impulses of opposite polarity will be sent to line.
These fingers u, v, x are supported in a base and there may be a number of
them around the same cylinder as shown in Figure 4 where there are four sets
R, R1, R¹¹, R
If it were desired to transmit simple pulsations without changes of polarity, the
metal spaces o o would be mere rectangles and only two fingers used, one connected
to the battery and the other to the line.
The relation in number of teeth between K and k and the number of metal
spaces o in each series in the cylinders is such that during one rotation of G, and
consequently of the arm I, a number of impulses equal to the number of keys in a
range is sent.
For instance while A is shown with only twenty-four keys, in each
range owing to limited space in the drawing, in practice it is proposed to give it
thirty, the number of segments in H, hence the adjustment of K, % and the spaces o
is such that during one rotation of G, fifteen spaces o in a reverser should pass
under one series of fingers.
It follows then that so long as the cylinders N N¹ are rotated, impulses or
reversals will be sent to the lines connected to each set of fingers. In order to
stop this rotation at any desired point, a magnetic stop is shown.
Upon the shaft of one of the cylinders, say n, is placed a ratchet wheel L, into
whose teeth may take the spring pawl O, made of reversed U shape to give some
spring or compensation for the shock of the sudden stoppage of the cylinders etc.
This pawl O is attached to the armature lever L' of the magnet M included in a
circuit to be hereafter described.
The teeth of L are so adjusted relatively to the metal spaces o o on N and the
other cylinders as to stop them in such position that two of the fingers of a set
are always, when the cylinders are at rest, contacting upon a metal space.

page_text: Therefore whenever M is charged, the rotation of the cylinders will be stopped and
the line or lines remain charged during such stoppage. The charging of M to
stop the rotation at the proper time, that is when the wheels of the distant
instruments are properly positioned, is accomplished by the following mechanism :-
In Figure 6 A is a key board having two concentric circular ranges of keys a a',
although it is evident these keys might be in straight parallel lines.
These keys
are simply straight pins, with enlarged heads, springs tending to normally keep
them up and away from the metal springs F on the insulating ring E.
The top of the key board is made of some insulating material and its base is
formed as a box. Upon the top a metal strip C is let in, through which all the
keys of the range a pass, making electrical contact therewith, while the range a¹
passes through the plain top being thereby insulated from the range a and from
each other.
Within the bottom and immediately below the two ranges of keys is a strip
or ring of insulating material E, upon which and below the range a¹ is a metallic
strip e.
Fixed to E are a series of metal strips or springs equal in number to the number
of keys in either range. The ends of each strip are bent up, around and over E,
so that one end is under a key a and the other end under a key a¹ and over the
metal piece e.
It should have been noted that the ends of the keys a¹ are tipped
with insulating material, their function being simply to force the end of a spring F
into contact with e.
The disk H, before referred to, consists of a series of segments c c insulated from
each other and from the rest of the apparatus. The segments are equal in number
to the springs F and each spring is connected to a corresponding segment by a
wire 2, these wires 2 for convenience, may be grouped into a cable O between a
and H. As before stated the arm I carrying the spring J ending in contact b is
rotated by shaft G so that b is carried over the segments in succession.
D represents a dynamo, being here typical of any form of generator.
The simplest form of circuit connections between all these parts for controlling H,
is the circuit through the range of keys a. Several arrangements of the circuit
may be made, all however substantially the same in principle.
-
In figure 2 a connection 2 is made from either pole of the dynamo, say for
convenience of description, the -pole to C, while the springs F are connected to the
segments c by connections 22. From the other or + pole of the generator, a
connection 1 leads through the magnet M to the arm I.
In figure 3 the springs and segments are also connected by 22, while from
the pole of the generator the connection 1 passes through M to the strip C, the
other pole of the generator being connected to arm I.
In both these circuitings it will be seen that ordinarily there is always one
break in the circuit 1, 2 through M, between a and F and that all the circuits
between F and H, excepting the one 6 is on at the moment are broken.
If a key be depressed closing the break between a and F, the circuit through M.
will be complete when b contacts with the segment connected to the depressed
key, thereupon M attracts L¹ which stops all the mechanism rotated by G, holding
the instrument at the distant end in the desired position or that indicated by the
depressed key.
In some printing telegraphs the positioning of one of two type-wheels for
printing is effected or controlled by a change in the normal strength of the
current. The circuit of the second range of keys a' is arranged for this.
In figure 2 this circuit is from the machine via 3 through relay magnets vv 211
to strip e. From the other pole of the machine via 1 through M to I, J then by. 22
to the springs F.
In figure 3 it is via 1 through M, beyond which 3 branches, from 1 through the
relays v_v¹ to e, while from the other pole it is via 15 to IJ thence by 22 to
T

page_text: If now a key in range a¹ be depressed, e and F are connected and the circuit
through M and the relays v v¹ closed, operating the relays as well as the stop.
In each line circuit 4, 5, 6, is a rheostat Rh., whose being in or out of circuit
shall effect the necessary variations, there being shunt circuits 7, 8, 12 thereto
controlled by the relays vvv11, one rheostat, shunt and relay for each line circuit.
As shown the shunts lead to the levers and back stops of the relays, so that the
shunts are normally closed and the resistances shunted out. When however the
relay is charged on depression of a key a', the shunt is broken, and the line current
immediately varied by the introduction of the resistance.
If it be desired to have the resistances normally in circuit the relay connections
of the shunts would be reversed.
The printing circuit is best shown in figure 3, P being a ratchet toothed wheel
upon the shaft of one of the cylinders, say n, a pawl p being provided to prevent
any retrograde motion. A spring board m is arranged before P and having its
upper end bent or bevelled so as to be struck or vibrated by the teeth of P. An
anvil m' is so adjusted that the key may contact therewith when its upper end
falls into a space between the teeth. This key may control directly the printing
circuit or control it through a relay T and local circuit 11. While P is in rotation
the rapidly recurring blows of the teeth upon m prevent it from contacting with m¹
at least sufficiently to cause a closure of the printing circuit. The teeth of P are so
adjusted relatively to the cylinders that whenever their and its motion is stopped
the end of m may fall between the teeth, allowing m and m' to contact.
In the circuit 11 a key S is placed by which the printing circuit may be broken,
so as to repeat the printing of a letter without repositioning the type-wheels.
Having thus described my invention, what I claim and desire to secure by Letters
Patent is
1. The combination, with a transmitter and a circuit for printing, of two relay
magnets, both in a local circuit controlled by the transmitter, one controlling the
printing circuit, the second controlling a shunt circuit around the first, substantially
as set forth.
2. The combination, with a transmitter controlling the escapement or type-wheel
circuit, of a local circuit and two relays therein, one controlling the printing circuit,
the second controlling a shunt to the first, so as to permit the first to close only
momentarily the printing circuit, substantially as set forth.
3. The combination of two relay magnets in one circuit, a main circuit controlled
by the first and a shunt circuit around the first controlled by the second, so as to
limit the control of the main circuit by the first relay, substantially as set forth.
4. The combination in a transmitter of one or more cylinders, each provided with
conducting spaces, fingers or springs taking thereon and circuit connections for
controlling one or more main lines, a prime motor therefor, a magnetically operated
stop controlling the motion of the cylinder or cylinders and a key board having
circuit connections as set forth and controlling the magnetic stop, substantially as
set forth.
5. The combination in a transmitter of one or more cylinders revolved by a
prime motor and each controlling the pulsations on one or more main lines and a
key board and local circuit controlling the movement of the cylinders, substantially
as set forth.
6. The combination in a transmitter of one or more cylinders, each controlling
one or more main lines, a prime motor therefor and a clutch connection between the
cylinder or cylinders for connecting the prime motor and cylinder or cylinders,
substantially as set forth.
7. The combination in a transmitter of a local circuit controlling the means for
throwing pulsations upon the main line or lines and having normally two breaks
therein, a key board controlling one break and a travelling circuit closer and
contacts controlling the second break, substantially as set forth.
8. In a transmitter having means for controlling the pulsations on the main line

page_text: or lines, the combination of a main circuit, a local circuit, a disk formed of
segments insulated from each other and a circuit closer travelling over such
segments, substantially as set forth.
9. The combination with a transmitter for controlling the main circuit and a
local circuit for controlling its movement, of means substantially such as described
for automatically closing the printing circuit upon the stoppage of the transmitter,
substantially as set forth.
10. The combination in a transmitter of a cylinder provided with a series of
conducting spaces and a series of fingers, each series of fingers and spaces controlling
a main line, substantially as set forth.
11. The combination in a transmitter of a key board having two concentric
or parallel ranges of keys and a series of springs or fingers, equal in number to the
keys in either range and fixed upon an insulating base, each spring being acted
upon by two keys, one from each range, a disk composed of segments equal in
number to the springs and circuit connections, one for each spring to its
corresponding segment, substantially as set forth.
12. The combination in a transmitter of a main and two local circuits, the local
circuits controlling the cutting out or throwing in of resistance into the main
circuit, substantially as set forth.
13. The combination with a transmitter, two local circuits and a main circuit,
of a resistance and a shunt thereto controlled by the local circuits, substantially as
set forth.
14. In a transmitter the combination of a key board having two ranges or sets
of keys, two local circuits, one for each range of keys, a magnetic stop for the
transmitter controlled by both circuits and a relay placed in one circuit and
controlling a shunt to a resistance in the main circuit, substantially as set forth.
15. A magnetic stop consisting of a ratchet wheel, a magnet, an armature lever
therefor and a spring pawl mounted upon and carried by the armature, substantially
as set forth.
16. A transmitter embodying the following elements, a cylinder or cylinders and
a series of fingers as described controlling the main circuit, a prime motor therefor
and a clutch connecting the motor and cylinder or cylinders, a magnetic stop
controlling the movement of the cylinder or cylinders, local circuits controlling the
stop and a key board controlling the local circuits, substantially as set forth.
In witness whereof, I, the said Herbert John Allison, have hereunto set my
hand and seal, this eighteenth day of June, in the year of our Lord one thousand
eight hundred and eighty-four.
TEDDEDT T ATTICON
J.
ATTISON
ISON