IMPROVEMENTS IN ELECTRIC TYPE PRINTING TELEGRAPH APPARATUS
Year: 1880

page_text: LETTERS PATENT to Georg Jonas Droste, of the City of Bremen, in the
16
German Empire, for an Invention of IMPROVEMENTS IN ELECTRIC TYPE
PRINTING TELEGRAPH APPARATUS.”
PROVISIONAL SPECIFICATION left by the said Georg Jonas Droste at the
Office of the Commissioners of Patents on the 18th September 1880.
GEORG JONAS DROSTE, of the City of Bremen, in the German Empire.
"IMPROVEMENTS IN ELECTRIC TYPE PRINTING TELEGRAPH APPARATUS."
Apparatus constructed according to this Invention belong to that class of type
printing telegraphs in which by continuous contact closings and interruptions of
the line current passing through the electro-magnets of the instruments in
connection the type disc is moved round from letter to letter until the type of
the letter to be telegraphed stands opposite the printing appliance, which when put
into action prints it on a paper band.
Through this the driving gear acting on the spindle of the type disc is released
or stopped by the armature lever of the electro-magnet, a fork shaped notch thereon
releasing or arresting one of two fly arms fixed on the escapement spindle, and
catching the other by each up and down movement of the armature. Fixed on the
same spindle and working in an upper cut out part of a piece swinging round an
axis like a pendulum, and provided below with lateral bars there is an eccentric,
which at the same time causes the release of the printing appliance; each of the
lateral bars carries below a small tooth wheel; the release of the printing appliance
takes place when one or the other of these small wheels by the pendulous
movement gets sufficient time to gear with a third or coupling wheel, situated
between both and moved by special wheel gearing, and to be carried about one
fifth of a revolution with it. This happens by each stoppage of the escapement
spindle of corresponding duration, and then a lever appliance is actuated thereby,
which is in connection with the appliances for the releasing and arresting of the
printing appliance as well as the coupling wheel.
The electric current has in this apparatus only the office of causing escape-
ment action, while it is itself constantly interrupted; everything else is done

page_text: or tooth spaces of the type wheel stand opposite the ink roller or the printing
roller respectively.
In this way the letter type or number type wheel can, as desired, be placed
opposite the printing roller, and by the release of the printing applianco a letter or
sign or number is printed.
The appliances for releasing the printing appliance consist of a system of parts
or bars which moves pendulum like, and is actuated by an eccentric round the
escapement spindle; two side bars are movable on pegs, and carry at their lower
ends each a tooth wheel. These wheels are, by small spiral springs, always pulled
back into their normal position; there are stops on the wheels to come against the
side bars and thus limit the turning of the wheels in the direction of tho action of
the springs. The foremost ends of the pegs so act on a double armed lever that
when, for instance, the left wheel gearing with the centre or coupling wheel is
turned thereby tho stop peg on it pressos the left lover arm down, but when the
right hand wheel gears with the coupling wheel the stop peg on the right wheel
raises the right hand lever arm. The two side bars are drawn together below by
a spring so far as stops permit it.
Each time this pendulous system is moved to one side one of the wheels is
brought to gear with the centre or coupling wheel, while the other is released
therefrom. If the pendulous movement follow very quickly upon one another the
wheels are moved little or nothing by the centro wheel, and cannot therefore
influence the aforesaid double armed lover; but if there are longer pauses between
tho movements, one or other of the side wheels will bo carried round by the centro
wheel until this latter is brought to a standstill, or the gearing into each other
ceases. The centre wheel stops the moment a rod at the lifting of the right hand
end of the double armed lever is raised so far that an arm fixed in the interior of
the apparatus on the same spindle catches against the fly of the works that drive
the centre wheel. The wheel carried round by the centre wheel, and which, by its
peg raises the right hand end of the double armed lever, and thus causes the centre
wheel to stop, remains in gear therewith and holds also the said lever end in its
raised position until, by the movement of the pendulous system, the gearing with
tho centre wheel ceases; this done, the spring pulls back the wheel into its former
position, and the right hand end of the lever drops by the weight of the rod and
lever. By this downward movement the works for the centro wheel are released
so that the latter can turn and be ready for further action.
A lever in connection with the double armed lever serves for releasing and
stopping the works for the printing appliance proper.
The revolution of the spindle of the printing escapement, which is also worked
by the double geared fusee spring drum, is effected in two movements answering
exactly to the releases of the escapement spindle.
This spindle of the printing escapement and printing appliance carries at the
front wall of the apparatus a wheel having 26 teeth, and also a cam which, by each
revolution, gears into a tooth space in a Maltese cross shaped wheel and carries it
with it so far. The 26 tooth wheel gears with a wheel having 52 teeth on the
spindle giving it half a turn. One of two pegs on the latter wheel bereby catches
under an arm and throws it up, thus also raising the printing roller with paper
band.
The paper band unrolls from a freely revolving reel and passes out through a
slot, going over the printing roller and draw roller; the band is moved one letter
forward at the time.
In describing the type wheel spindle it was said that it could be shifted within
certain limits, and that these movements are accomplished by the printing gear
and a spring. Theso movements take place at those moments when the blank
spaces stand opposite the ink roller on one side and the printing roller on the other
side.
A catch fastened to the type wheel spindle holds it in its lowest position.
Before the movement in the opposite direction can take place the catch must be

page_text: released, and a spring will then bring the spindle back into its original or raised
position. An eccentric fixed on the spindle of the printing escapement serves to
release it, so that by each revolution which takes place by that position of the type
wheel spindle which it assumes exactly half a revolution after the said movement
of the type wheels, the nose of the catch will be raised and the spindle pushed back
by the spring.
In so far as the connections can be so arranged also in this apparatus that when
there is no telegraphing going on the current circulates in the line wire or not, we
may speak of a circuit connection of rest and a circuit connection for work.
In the first case all the instruments connected in a line wire ready to receive
when the handles for connecting and disconnecting are pushed on to a bar. The
circuit of the batteries in connection is closed and the armatures attracted. In
this position the spring is off the contact.
Supposing all the apparatus are set alike, say, on the letter blank, and let a
handle on any of the instruments in connection be turned, and let the dial key
board at the same time be arrested on the next field or space by depression of the
key in question, then the whole circuit is at once interrupted. All the armatures of
the apparatus in connection drop off simultaneously, the released escapement
spindle makes half a turn, the type wheels move a letter or sign space, and the
current interrupter half a cam wave forward. The stopping of the dial key board
is however so connected with the clockwork that its escapement spindle does not
--quite complete its half revolution, but is held fast just before the stopping, from
which it follows that the current interrupter also remains in the-position in which
the contact is not yet closed. So long as the key in question is thus depressed, the
circuit remains interrupted-and-tho-armatures_off; they are only attracted again
-when-tho-contact_on_the_transmitting instrument closes, that is, as soon as the key-
is let go, the escapement spindle then completing the rest-of-the-half-rovolution,
thus permitting the current interrupter to move so far forward that the spring is
pressed against the contact. The stopping of the next following key would again
cause the armatures to remain attracted, whereby the escapement spindle of the
transmitting instrument shortly before its stoppage will be held fast, and the
contact be opened again only then when this key also is released.
In this manner I cause the automatic closing and opening of the circuit by the
apparatus in the transmitting or while going into the transmitting position, also
that the stopping of it in any position produces the corresponding stoppage of the
other instruments, and that when the. stoppage ceases, the instrument starts
automatically and influences the other instruments in a similar manner.
With the circuit connection for work, the instruments are ready for receiving
when the handle is pushed so that there is no current circulating; the armatures
are off, and the spring is against the contact. As soon as the landlo in one of the
connected instruments is pushed over, the current from its battery circulates to
carth; the armatures are attracted and release the driving gear in question, which
again causes a half revolution of the escapement spindle, the forward movement of
the current interrupter, and so on. The instrument being now in the transmitting
position, influences the other instrument quite in the same manner as already
described with reference to the circuit connection of rest.
The interruption of the transmitting system by the receiving takes place by the
current of rest, as well as by the current of work, through insulation of the handle,
that is, by that position of same in which it is disconnected from both stops.
In order that two instruments connected by a telegraph wire should always
print the sign answering to the depressed key on either of them, the instruments
must be started from the saine sign or letter, and the spindle of the current
interrupter and of the type wheels gear so with the dial spindle that the same
signs which are marked by the dial hand or stop arm of the dial spindle are also
opposite to the printing roller. For the current circuit of rest, the setting on letter
blank would be most suitable, and for the current circuit of work, that of numerals
or number blank.

page_text: The starting of the instruments is, as already described with reference to the
circuit, done by putting the current interrupter in the transmitting instrument into
the line circuit by means of the handle. The breaks and closings of the circuit
now taking place in regular alternations, influence simultaneously the electro-
magnets of the instruments connected, and cause the arinatures to be attracted and
released, whereby the current interrupter of the transmitter is kept going auto-
matically as described. Each armature movement causes the release of the
escapement spindle for half a revolution, and this again the step by step forward
movement of the current interrupter, the type wheels, and the dial hand, and also
on the other hand, by means of the eccentric, the alternate movement of the
pendulous system. If two instruments have been set to the same sign, then the
same signs must any moment be opposite the printing roller, and be printed when
the printing appliance is released.
By each first movement of the pendulous system, one of the small wheels is put
out of gear with the central or coupling wheel, and is by its spiral spring pulled
back into its original position, and the rod resting on the right arm of the double
arined lever hence moves down. Hereby the works for driving the centre wheel
are released, and the works for driving the printing appliance, as regards the first
part of its movement which serves to move the paper band, are also released. If
this first pendulous movement is followed by quickly following further movements,
so that neither of the side-wheels-have-timo-to-get into gear with the centre wheel,
then the printing appliance remains in its position. But as soon as a transmitter
is arrested by the depression of a key thereon, the side wheel just coming up against
the centre wheel will come into gear therewith, is carried-along-thereby, thus.
causing the centre wheel-to-be-stopped-and-on-the-other haud accomplishing the
second part of the release of the printing appliance which effects the raising of the
printing roller, and puts in motion the works for moving the type wheel spindle.
The type wheel for the letters is nearest the wall of the instrument. When
the type wheel spindle is pushed so far forward as the stop on it will permit, then
the letter type wheel is opposite the printing roller, when the type wheel spindle is
pushed so far back that the nose of the catch lever is held by the flange on the
bush, then the numeral or sign type wheel is opposite the printing roller. The
first named position is attained by the escapement spindle of the printing appliance
and spring, and the second by the lateral driving gear in connection with the
lifting gear for the printing appliance, whereby the stops against the type wheel
spindle are opposite the before described driving parts, and the type wheels opposite
the blank spaces of the printing roller as marked by the dial key board, so that by
cach depression of the blank key in question the type wheels are moved corre-
spondingly.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Georg Jonas Droste in the Great Seal Patent Office on the 18th
March 1881.
GEORG JONAS DROSTE, of the City of Bremen, in the German Empire.
"IMPROVEMENTS IN ELECTRIC TYPE PRINTING TELEGRAPH APPARATUS."
Apparatus constructed according to this Invention belong to that class of type
printing telegraphs in which by continuous contact closings and interruptions of
the line current passing through the electro magnets of the instruments in con-
nection, the type disc is moved round from letter to letter, until the type of the
letter to be telegraphed stands opposite the printing appliance, which when put
into action prints it on a paper band. Through this the driving gear acting on the
spindle of the type disc is released or stopped by the armature lever of the electro
magnet, a fork shaped notch thereon releasing or arresting one of two fly arms
fixed on the escapement spindle, and catching the other by cach up and down
movement of the armature. Fixed on the same spindle, and working in an upper cut
out part of a piece swinging round an axis like a pendulum, and provided below
with lateral bars there is an eccentric, which at the same time causes the release of
the printing appliance; cach of the lateral bars carries below a small tooth wheel;
the release of the printing appliance takes place when one or the other of these
small wheels by the pendulous movements gets sufficient time to gear with a third or
coupling wheel, situated between both and moved by special wheel gearing, and to
be carried about one fifth of a revolution with it. This happens by each stoppage of
the escapement spindle of corresponding duration, and then a lever appliance is
actuated thereby, which is in connection with the appliances for the releasing and
arresting of the printing appliance, as well as the coupling appliance or wheel.
The electric current has in this apparatus only the office of causing escapement
action, while it is itself constantly interrupted; everything else is done by purely
mechanical influences, as will be understood from the following, in which I describe
the principal parts of the apparatus and their mode of action in reference to the
accompanying Drawings on Sheets 1, 2, 3, and 4.
1. THE TRANSMITTER OR DIAL KEY BOARD.
All round the vertical spindle a, Figures 1, 2, and 3, of the key board there are,
Gay, 20 keys radially placed round a dial plate; each key is at its outer end fitted
with a small ebonite key plate, and has a peg below. Under the key bearing

page_text: and similarly fixed by screws to a polished mahogany box containing the paper
band roll, and serving for the fixing of the necessary disconnecting appliances and
binding screws for the wire connections. The required movements are effected by
three separate clockworks, driven by a single geared and a double geared fusee box,
the single geared one driving the spindles of the escapement of the current
interrupter with key board end of the typo wheel; the double geared one moves
the spindle of the coupling wheel, and also causes the paper band to be moved
along, lifting also the printing appliance, and putting in motion the parts that serve
b
The spindle 6 (Figure 5, Sheet 3) of the current interrupter projects out through
the front wall of the apparatus, and there has its bearing in an angle bracket d,
Figure 1, Sheet 1, and, Figure 5, Sheet 3, carries there also an ebonite disc (i
with wavy periphery or cam groove, which serves to guide a peg d on the
horizontal arm of a bell crank lever ', Sheet 1, and Figure 5, which is mounted
on the spindle d³, Figure 1, Sheet 1, the disc d' moving it thirteen times up and
down in one revolution; in consequence of this the other arm of the bell crank lever,
which is fitted with a contact spring d³, Sheet 1, moves against and away from
the contact screw do.
The spindle bearing and the nut ds of the contact screw d are insulated
from the apparatus by pieces of ebonite, and are by binding screws connected to
the ends and d10 of the line wire; there is thus formed a selfacting current
interrupter.
The spindle b carrying the ebonito disc d' is by each half revolution of the
escapement spindle co moved so far round that the peg working in its cam groove
moves once up and down, and then the spring d³ closes or opens the contact
(Figure 5, Sheet 3).
The bevel wheel b¹ (Figure 5, Sheet 3), and the deep shrouded tooth wheel b² in
the interior of the apparatus on the same spindle b, and gearing respectively with
the bevel wheel a³ (Sheet 2) of the dial hand spindle, and with the spur wheel e'
(Figure 5, Sheet 3) on the type wheel spindle, move the dial hand spindle and the
type wheel spindle simultaneously and in unison; the type wheel spindle gearing
with the shrouded spur wheel b³ can be moved length wise to some extent.
Each release of the escapement spindle thus produces the break and make of
contact at d (Sheet 1), and simultaneously also the moving of the type wheel and
hand from one letter or sign to another.

page_text: On Figure 3, Sheet 2, and Figure 6, Sheet 3, is shown a system of parts or bars
which move pendulum like around the point c³, and is actuated by the eccentric c²,
Sheet 2, and Figure 6, Sheet 3, round the escapement spindle. The two side bars c
and care movable on the pegs c6 and c³, and carry at their lower ends each a
tooth wheel c³ and c. These wheels are influenced by small spiral springs fastened
at one end to the wheel spindles, and at their other end to the pegs cl and c¹¹,
that they are always pulled back into their normal position; the pegs or stops
protrude through the front side at the periphery of the wheels so as to come
against the side bars c, c³, and thus limit the turning of the wheels in the
direction of the action of the springs. The foremost ends of the pegs so act on
the double armed lever g which swings round the point gl, and has its bearing in
the angle bracket g³, that when, for instance, the left wheel gearing with the
centre or coupling wheel is turned thereby in the direction of the arrow, the stop
peg c¹o on it presses the left lever arm down, but when the right hand wheel c
gears with the coupling wheel, the stop peg c¹¹ on the right wheel raises the right
hand lever arm. The two side bars and are drawn together below by the
spring c¹ so far as the stops c¹³ and c¹ permit it.
Thus each time this pendulous system is moved to one side, one of the wheels is
brought to gear with the centre or coupling wheel, while the other is released
therefrom; the spring c¹ at the same time gives so as to prevent the wheel teeth
from injury even if two teeth should come against each other or other irregularity
take place. If the pendulous movement follow very quickly upon one another the
wheels are moved little or nothing by the centre wheel, and cannot therefore
influence the aforesaid double armed lever g; but if there are longer pauses
between the movements, one or other of the side wheels will be carried round by
the centre wheel until this latter is brought to a stand still or the gearing into
each other ceases. The centre wheel stops the moment the rod h at the lifting of
the right hand end of the double armed lover g is raised so far that the arm h²
fixed in the interior of the apparatus on the same spindle h¹ (see Figure 3, Sheet 2,
and Figure 5, Sheet 3) catches against the fly h³ of the works that drive the centre

page_text: wheel. The wheel carried round by the centre wheel, and which by its peg raises
the right hand end of the double armed lever g, and thus causes the centre wheel
to stop, remains in gear therewith, and holds also the said lever end in its raised
position until by the movement of the pendulous system the gearing with the
centro wheel ceases; this done, the spring cl2 pulls back the wheel into its former
position, and the right band end of the lever drops by the weight of the rod h
and lever so far as the peg cl will permit. By this downward movement the
lever drops out of his fly and releases the works for the centre wheel, so that the
latter can turn and be ready for further action.
The lever i, which rests loosely on the rod h and goes up and down with it,
serves for releasing and stopping the works for the printing appliance proper,
inasmuch as tho sweep i, which is fixed on the same spindle as i, when the latter
goes up is raised to the left, and vice versa, so that the escapement ², Figure 7,
Sheet 3, for the printing appliance slides off the peg or pallet is and is caught by
the pallet i, and when i goes down it glides off and is caught by 1³.
The revolution of the spindle K of the printing escapement, which is also worked
by tho double geared fusee spring drum, is effected in two movements corresponding
to the up and down motion of the rod h and lever i, and answering exactly to the
al of the MARS
nilla

page_text: the escapement spindle of the transmitting instrument shortly before its stoppage
will be held fast, and the contact between fand y be opened again only then, when
this key also is released.
In this manner I cause the automatic closing and opening of the circuit by the
apparatus in the transmitting or while going into the transmitting position, also
that the stopping of it in any position produces the corresponding stoppage of the
other instruments, and that when the stoppage ceases the instrument starts
automatically and influences the other instruments in a similar manner.
The setting of the instruments is such that the position of the dial hand or the
type wheel on the letter blank B, D, F, H, K, M, N, P, R, T, V, Y corresponds to
the attracted armature, and that of the dial hand or type wheel on A, C, E, G, F, L
numerals, and sign blank O, Q, S, U, W, and Z corresponds to the released
armature.
With the circuit connection for work the instruments are ready for receiving
when the handle a is pushed to c, and the handle b to e; there is then no current
circulating, the armatures are off, and the spring g is against contact f. As soon
as the handle a in one of the connected instruments, say I, is pushed over on to
har d, the current from its battery I circulates from K through binding screw 6,
handle b, contact, spring 9, bar d, hundle a, binding screw 5, electromagnet,
binding screw 2, line wire to II., binding screw 2, electromagnet, binding-screw 5,
handle a, stop e, binding screw 1 to earth; the armatures are attracted and release
the driving gear-in-question,-which-again-causes.a.half revolution of the escapement
spindle, the forward movement of the current interrupter, and so on. The instrument
being now in the transmitting position influences the other instrument-quite-
in the same manner as already described with reference to the circuit connection
of rest.
The interruption of the transmitting system by the receiving takes place by the
current of rest as well as by the current of work through insulation of the handle a,
that is hy that nosition of came in which it is disconnected from both stone a
The starting of the instruments is, as already described with reference to the
circuit, done by putting the current interrupter in the transmitting instrument
into the line circuit by means of the handle. The breaks and closings of the
circuit now taking place in regular alternations influence simultaneously the
electromagnets of the instruments connected, and cause the arinatures to be
attracted and released, whereby the current interrupter of the transmitter is kept
going automatically as described. Each armature movement causes the release of
the escapement spindle for half a revolution and this again the step by step
forward movement of the current interrupter, the type wheels, and the dial hand,
and also, on the other hand, by means of the eccentric the alternate movement of the
pendulous system. If two instruments have been set to the same sign, then the

page_text: centre wheel to be stopped, and on the other hand accomplishing the second part or
the release of the printing appliance, which effects the raising of the printing roller
and puts in motion the works for moving the type wheel spindle.
c.―The Motion of the Type Wheels for the Different Sorts of Signs.
The type wheel for the letters is nearest the wall of the instrument, and the
numeral or sign type wheel in front of it. When the type wheel spindle is pushed
so far forward as the stop on it will permit, then the letter type wheel is opposite
the printing roller; when the type wheel spindle is pushed so far back that the
nose of the catch lever is held by the flange on the bush, then the numeral or sign
type wheel is opposite the printing roller. The first named position is attained by
the thrust of the lever o, Figures 5 and 7, Sheet 3, by the escapement spindle of
the printing appliance and spring e'; and the second by the lateral driving gear
in connection with the lifting gear for the printing appliance, whereby the stops
against the typo wheel spindle are opposite the before described driving parts, and
the type wheels opposite the blank spaces of the printing roller as marked by tho
dial keyboard, so that by each depression of the blank keys in question the type
wheels are moved correspondingly.
And having thus described and ascertained the nature of this Invention, and the
mode in which it may be carried into effect, I declare that I claim,―
First. An electric type printing telegraph apparatus with several driving works,
having a retarded or escapement movement influenced by the electro magnets, and
in such manner that the oscillations of the armature of the electromagnet in all
instruments in the same circuit are in exact mutual agreement with the revolutions
of the different type wheels, whereby the type wheels simultaneously are caused to
print the same letter or other sign.
Second. An electric type printing telegraph apparatus with one electroimagnet,
the current interrupter of which is moved by a driving gear in like moments
as the escapement or movement of the armature, so that the action of the
electromagnet and that of the driving gear are mutual and dependant upon one
another.
Third. In electric type-printing telegraph apparatus, the escapement, Figure 6,
Sheet 3, for the purpose of obtaining synchronous working of all instruments in a
circuit.
Fourth. In electric type printing telegraph apparatus, the pendulous system
swinging round the point c³, Figure 3, Sheet 2, having bars c³, c³, and in combina-
tion with the eccentric c³ for moving it, and with the stops c¹³ and c¹.
Fifth. In electric type printing telegraph apparatus, the coupling wheel centrally
between the wheels c³ and c, having pegs co and c", with spiral springs fastened
thereto, in combination with the double armed lever g moved by the pegs, the

page_text: bracket g³, and the tension spring c¹, for the purpose of releasing the printing
appliance at fixed intervals.
Sixth. In electric type printing telegraph apparatus, the escapement retarding
of the printing appliance, namely, consisting of the levers e, i, 3, the fixed sweep i¹,
and the pallets 2³, 2.
Seventh. In electric type printing telegraph apparatus, the printing appliance
moved at intervals by a special driving gear, the retarding escapemont gear being
released at suitable times by the pendulous system c², c³, c².
Eighth. In electric type printing telegraph apparatus, the combination of an
electromagnet with the escapement of the type wheel driving gear.
Ninth. In electric type printing telegraph apparatus, the combination of the
escapement of a type driving gear with the pendulous system c*, c³, c³.
Tenth. In electric type printing telegraph apparatus, the combination of the
pendulous system c', c, c, with the escapement of the printing appliance.
Eleventh. In electric type printing telegraph apparatus, the axial length displace-
ment of the type wheel spindle, which is constantly actuated by the spring c² in
the direction of the front wall of the instrument by pressure on the letter blank or
number blank key, so that the catch with noso e is brought into action, in
the manner and for the purpose set forth in section c of part II. of this
Specification.
Twelfth. The self acting current interrupter, consisting of an ebonite disc d'
with wave shaped periphery in combination with a thereby influenced lever <*
and contact spring do with contact spring do, in the manner and for the purpose set
forth in section b of part II. of this Specification.
Thirteenth. In connection with the pendulous system for releasing the printing
appliance, the double armed lever g, and the lever rods h² influenced thereby in
such manner that they either are raised by the pressure of the peg c¹º on the left
arm of the lover or by the pressure of the peg c" on the right arm, and the
escapement i, is, is thereby released.
Fourteenth. The connection of the pendulous system with the lever h³, h³, for the
purpose of arresting or releasing the fly h³.
Fifteenth. In electric type printing telegraph apparatus, the Maltese cross moving
forward the space of a letter for moving the paper band.
Sixteenth. The combination of a dial keyboard with a type printing telegraph
apparatus, substantially as shown in Figuros 1 to 9, so that the vertical spindle of
the dial hand is connected to the horizontal spindle b of the instrument by bevel
wheels a³ and b¹.
Seventeenth. The combination of parts forming my electric type printing
telegraph apparatus, substantially as described and shown.
Eighteenth. The current circuit, as shown in Figure 10, Sheet 4, and described
in part III. of this Specifiation, in combination with the Droste type printing
telegraph apparatus.
In witness whereof, I, the said Georg Jonas Droste, have hereunto set my hand
and seal, this Tenth day of March, in the year of our Lord One thousand
eight hundred and sighty one
GEORG JONAS DROSTE. (L.S.)