Improvements in Apparatus for Transmitting Orders, Notifications, and the like from One Part or Station of a Navigable Vessel to Another, and analogous purposes.
Year: 1894

page_text: Date of Application, 20 h Nov., 1894
Complete Specification Left, 20 in Aug., 1895-Accepted, 16th Nov.,
1895
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Transmitting Orders, Notifications,
and the like from One Part or Station of a Navigable Vessel to
Another, and analogous purposes.
I, WILLIAM CHADBURN, of 11 Waterloo Road, Liverpool, in the County of
Lancaster, Telegraph Engineer, do hereby declare the nature of this invention to
be as follows:-
This invention has reference more particularly to apparatus used on board ship
for communicating between one part of the ship and another, and for transmitting
conditions of machinery, and notifications, from the part where such machinery is
located, to another part, or other parts, where it is desired to shew or indicate the
same; and the type of apparatus to which this invention is particularly applicable
is that in which the transmission of orders and the conditions, etcetera, is effected
by means of shafts or rods, and toothed gearing, which are rotated, and also to
apparatus wherein the transmission of motion is effected by chains or cords.
This invention will, for convenience, be mainly described as applied to apparatus
of the kind referred to, wherein the transmission rods or chains receive such an
amount of motion, as would ordinarily move the indicating pointer or pointers, or
the like, if directly connected with same, a greater part of a circle or other move-
ment than it is desired they should receive and where such movement is reduced so
as to give the pointer or pointers the actual requisite amount of movement.
According to this invention, the pointers of telegraphic apparatus of the kind
referred to are operated through a device or mechanism through which they will be
moved relatively a less amount than the shaft, or chain-driven part, by which they
are actuated and further, by which they are moved sharply from one order to
another, and not during the whole period of movement of the transmitting
instrument or means, and are, moreover, positively moved into the centre of each
order or the exact position required, and positively prevented from moving there-
from during their periods of rest. One form of such device or mechanism consists
of a wheel, disc, or the like, with a provision or provisions thereon, mounted on, or
actuated by the operating shaft or chain driven part, while on or in connection with
the indicating pointer, or the like, there is employed another wheel, disc, or the like,
with provisions thereon, adapted to be engaged by or engage with that or those of
the former wheel or device, and so arranged and adapted to work, that while the
former wheel or the like may be making a number of revolutions in continuous
movement, the latter wheel or the like will be driven thereby intermittently,
(riz. whenever the engagement between the two is effected) with a period of rest,
the movement of the pointer will be the same, that is, it will be moved sharply and
positively into the centre or correct position over or in connection with the dial,
and will be positively prevented from being moved from this position until the
apparatus is actuated to give another order, notification, or the like. By this means
mistakes due to errors or defects of mechanism are rendered impossible, and the
desired and correct action of the apparatus assured.
One form of such device or mechanism may consist of a tooth or the like on a
wheel or disc on the shaft or chain-driven part, or say two of same, adapted to
engage with a wheel connected with the pointer, having a greater number of corre-
sponding recesses or the like, and curved spaces between such
such spaces
recesses,

page_text: being formed so that the former wheel will move on said parts and prevent the
wheel thereof from rotating when no actuating engagement is made between the
wheels. Thus, the pointer wheel and pointer are both positively moved, and
positively prevented from being moved, intermittently, and at the correct or desired
time. Other equivalent mechanisms, however, by which the same action or actions
is or are obtained may be used in its stead. As for instance, an irregular threaded
screw having a part or parts with pitch or inclination, and a part or parts having
little or no pitch will effect the action; the said screw being adapted to operate
a suitable toothed or stud wheel or equivalent device connected with the pointer.
In one arrangement of parts of apparatus, the transmission of orders, notifications,
etcetera, is effected by rods or shafts (or chain or cords) actuated by a wheel or
handle at the transmitting instrument, which, say, is adapted to be rotated one
revolution to move the indicating instrument pointer one, and each order or notifi-
cation, and (the said shafting being driven, say, half the amount of that of this
actuating wheel or handle, or other suitable proportion, that would be greater than
the amount of movement it is required to move the pointer or pointers of the
receiving instrument, or receiving and transmitting instrument), the pointers are
connected or operated from said shaftings (or parts driven thereby through a
mechanism or movement such as above specified, which gives to said pointers
a reduced and correct amount of movement, and also a sharp movement, bringing
the pointer positively into the centre of the orders or to the position required.
"
According to another part of this invention there is combined with apparatus
wherein the transmission rods or chains are moved a greater amount at each
actuation than would move the indicating pointer or pointers from one order to
another, a duplex gong or sounding devices by which different sets of orders have
used in connection with them sounding devices of different tones, such sounding
devices being so arranged and adapted in the receiving or indicating instrument
that one gong will be used in connection with all orders or notifications in the
"Ahead
field or set,-.e. of course in an engine room telegraph-and the other
gong in connection with the other field or set, riz., the "Astern set. In carrying
out this combination and arrangement, the gongs or the like are introduced in the
instrument between the pointer or indicator reducing gearing on and driven by the
shafting or chain, and operating the pointer spindle of the receiver or equivalent
part, and on or in connection with which the gongs or bells or their striking
mechanism is disposed or works, whereby the mechanism would be only operated at
the speed or amount of the pointer, and so rendering the employment of duplex
sounding devices of the kind referred to, when one gong is used for one set
of orders, as Ahead," and another for the other set, as 66 Astern," in connection
with telegraphic apparatus of the type above referred to, possible and practicable.
This feature may be used with advantage in connection with any suitable type of
ships telegraphic apparatus where the amount of the transmitting rods, shafting,
chain, rope, or the like, is greater than that of the receiving instruments pointer or
indicator as hereinabove referred to.
66
In connection with apparatus of the kind or kinds herein referred to, in some
cases I may employ sounding means as a gong or gongs which is or are adapted to
ne sounded by the transmission rods or their equivalent, at or about the commence-
ment of the movement of the actuating wheel or the like, and also as or when the
indicating pointer or pointers is or are moved into the centre of the orders, or in
their correct position.
In some cases where the indicating pointer of the receiving instrument is moved
as described, that of the transmitting instrument may be adapted to be moved
continuously by ordinary gearing when the hand actuating means, handle, or the
like is moved.
In another form of apparatus for transmitting the relatively large amount of
movement to the transmission shafting or chains, I employ a lever or arm adapted
to have reciprocating movement, so that, say for each reciprocation, an order or
notification will be transmitted. And further, this, in some cases is constructed so

page_text: "
that the movement or reciprocations of said lever or arm, for one set of orders,
as "Ahead orders in an engine telegraph, are effected, when moved at one side
or field of movement, and the other set of orders, as "Astern," at the other side,
or another field of movement. And, suitable mechanism is provided in some cases
in connection with same, by which said lever is prevented from moving or being
moved into one field of motion corresponding with one set of orders or notifications,
while the opposite set of directions or orders of engines, or the like, is in fact in use
or operation. This may be carried out by employing ratchet devices, or the like,
and automatic locking means (or non-automatic means); or by a switch mechanism,
to throw the lever or part operated thereby, into and out of action with one or the
other mechanism or parts for effecting these actions and ends. However, other
suitable movements or mechanisms for effecting this may be employed.
In the case where the transmission of orders, notifications or the like is effected
by a lever or handle, the whole range of motion of which is at most one complete
circle, or say a greater part of a circle-as for instance, in the case of there being
say three or five orders or notifications, or movements of the indicator, or even the
ordinary or full number of same, in the whole range thereof,-the actuation or
movements of the pointers in the manner described may, be applied and used in
connection with same; and also by suitable adaptation or modification, be carried
out in connection with various special cases or applications.
In the above description certain special applications and modifications have
been described, but it is to be understood that my invention is not necessarily
restricted to these, as they constitute only so many examples or particular types
of telegraphic apparatus and specific forms or parts thereof, thereunder.
Dated this 19th day of November 1894.
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15 Water Street, Liverpool, Applicant's Patent Agents.
Improvements in Apparatus for Transmitting Orders, Notifications,
and the like from One Part or Station of a Navigable Vessel to
Another, and analogous purposes.
I, WILLIAM CHADBURN, of 11 Waterloo Road, Liverpool, in the County of
Lancaster, Telegraph Engineer, 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 :-
This invention has reference more particularly to apparatus used on board ship
for communicating between one part of the ship and another, and for transmitting
couditions of machinery, and notifications, from the part where such machinery is
located, to another part, or other parts, where it is desired to shew or indicate the
same; and the type of apparatus to which this invention is particularly applicable
is that in which the transmission of orders and the conditions, etcetera, is effected
by means of shafts or rods, and toothed gearing, which are rotated; and also to
apparatus wherein the transmission of motion is effected by chains or cords.
This invention will, for convenience, be mainly described as applied to apparatus
of the kind referred to, wherein the transmission rods or chains receive such an
amount of motion, as would ordinarily move the indicating pointer or pointers, or
the like, if directly connected with same, a greater part of a circle or other
movement than it is desired they should receive and where such movement
is reduced so as to give the pointer or pointers the actual requisite amount of
movement.
According to this invention, the pointers of telegraphic apparatus of the kind

page_text: referred to are operated through a device or mechanism through which they will
be moved relatively a less amount than the shaft, or chain-driven part, by which
they are actuated; and further, by which they are moved sharply from one order
to another, and not during the whole period of movement of the transmitting
instrument or means, and are, moreover, positively moved into the centre of each
order or the exact position required, and positively prevented from moving there-
from, i.e. held, during their periods of rest. One form of such device or
mechanism consists of a wheel, disc, or the like, with a provision or provisions
thereon, mounted on, or actuated by the operating shaft or chain driven part,
while on or in connection with the indicating pointer, or the like, there is employed
another wheel, disc, or the like, with provisions thereon, adapted to be engaged by
or engage with that or those of the former wheel or device, and so arranged and
adapted to work, that while the former wheel or the like may be making a number
of revolutions in continuous movement, the latter wheel or the like will be driven
thereby intermittently (viz. whenever the engagement between the two is effected),
with a period of rest. The movement of the pointer will be the same, that is, it
will he moved sharply and positively into the centre or correct position over or
in connection with the dial, and will be positively prevented from being moved
from this position until the apparatus is actuated to give another order, notifi-
cation, or the like. By this means, mistakes due to errors or defects of mechanism
are rendered impossible, and the desired and correct action of the apparatus
assured.
One form of such device or mechanism may consist of a tooth or the like on a
wheel or disc on the shaft or chain-driven part, or say two of same, adapted to
engage with a wheel connected with the pointer, having a greater number of
corresponding recesses or the like, and curved spaces between such recesses, such
spaces being formed so that the former wheel will move on said parts and prevent
the wheel thereof from rotating when no actuating engagement is made between
the wheels. Thus, the pointer wheel and pointer are both positively moved, and
positively prevented from being moved, intermittently, and at the correct or
desired time. Other equivalent mechanisms, however, by which the same action
or actions is or are obtained may be used in its stead. As for instance, an irregular
threaded, screw having a part or parts with pitch or inclination, and a part or parts
having little or no pitch will effect the action; the said screw being adapted to
operate a suitable toothed or stud wheel or equivalent device connected with the
pointer.
In one arrangement of parts of apparatus, the transmission of orders, notifi-
cations, etcetera, is effected by rods or shafts (or chain or cords) actuated by a
wheel or handle at the transmitting instrument, which, say, is adapted to be
rotated one revolution to move the indicating instrument pointer one and cach
order or notification, and (the said shafting being driven, say, half the amount of
that of this actuating wheel or handle, or other suitable proportion that would be
greater than the amount of movement it is required to move the pointer or
pointers of the receiving instrument, or receiving and transmitting instrument)
the pointers are connected or operated from said shaftings (or parts driven
thereby) through a mechanism or movement such as above specified, which gives
to said pointers a reduced and correct amount of movement, and also a sharp
movement, bringing the pointer positively into the centre of the orders or to the
position required.
According to another part of this invention there is combined with apparatus
wherein the transmission rods or chains are moved a greater amount at each actuation
than would move the indicating pointer or pointers from one order to another, a duplex
gong or sounding devices by which different sets of orders have used in connection
with them sounding devices of different tones, such sounding devices being so
arranged and adapted in the receiving or indicating instrument that one gong will
be used in connection with all orders or notifications in the "Ahead" field or set,-
that is, of course, in an engine room telegraph, and the other gong in connection

page_text: "
with the other field or set, viz., the "Astern set. In carrying out this com-
bination and arrangement, the gongs or the like are introduced in the instrument
between the pointer or indicator, and the reducing gearing on and driven by the
shafting or chain, and operating the pointer spindle of the receiver or equivalent
part, on or in connection with which the gongs or bells or their striking
mechanism is disposed or works, whereby the mechanism would be only operated
at the speed or amount of the pointer, and so rendering the employment of duplex
sounding devices of the kind referred to, when one gong is used for one set of
orders, as " Ahead," and another for the other set, as "Astern," in connection with
telegraphic apparatus of the type above referred to, possible and practicable. This
feature may be used with advantage in connection with any analogous type of ship's
telegraphic apparatus where the amount of the transmitting rods, shafting, chain,
rope, or the like, is greater than that of the receiving instruments pointer or
indicator as hereinabove referred to.
In some cases where the indicating pointer of the receiving instrument is moved
as described, that of the transmitting instrument may be adapted to be moved
continuously by ordinary gearing when the hand actuating means, handle, or the
like is moved.
In another form of apparatus for transmitting the relatively large amount of
movement to the transmission shafting or chains, 1 may employ a lever or arm
adapted to have reciprocating movement, so that, say for each reciprocation, an
order or notification will be transmitted.
In the case where the transmission of orders, notifications or the like is effected
by a lever or handle, the whole range of motion of which is at most one complete
circle, or say a greater part of a circle-as for instance, in the case of there being
say three or five orders or notifications, or movements of the indicator, or even the
ordinary or full number of same, in the whole range thereof-the actuation or
movements of the pointers in the manner described may be applied and used in
connection with same; and also by suitable adaptation or modification, be carried
out in connection with various special cases or applications.
In the above description certain special applications and modifications have been
described, but it is to be understood that my invention is not necessarily restricted
to these, as they constitute only so many examples or particular types of telegraphic
apparatus and specific forms or parts thereof, thereunder.
To enable the invention to be clearly and fully understood, drawings illustrative
of it are hereto annexed, and the invention will now be described with the aid of
these drawings.
The machinery given is an example of apparatus illustrating the invention as
applied to ordinary ships' telegraphic purposes, for communicating between the
bridge or other part of the ship, and the engine room.
Figure 1 shews the apparatus in sectional elevation, the transmitting instrument
being shewn at the top of the figure, and the receiving instrument at the bottom;
the two being connected together by shafting and bevelled wheels.
Figure 2 shews a front view of the receiving instrument, illustrating the dial and
pointer. And
Figures 3 and 4 shew the means of actuating the pointer of the receiving
instrument, and by which the mode of action and the effects herein described are
produced; the position of the mechanism in Figure 3 being that when the pointer
is being moved; while that in Figure 4 shews the position when the pointer is
stationary and held.
Figure 5 is an elevation shewing the actuating mechanism employed in this
apparatus for the transmitter pointers and the stop mechanism.
Figures 6 and 7 are mechanisms being equivalents of that shewn in Figures 3
and 4-for actuating the receiving instruments pointer.
Referring in the first instance to Figure 1, A denotes generally the head of the
transmitting instrument; and B is the stand on which it is carried. C designates
the bridge or deck of the ship; and D is the receiving instrument..

page_text: The shafting by which communications are transmitted from one instrument to
the other is designated a, and at the parts or points thereof where the direction of the
shafting is changed-generally at right angles-there are bevel wheels a'. bis
a. hand operated wheel by which the shafting a is revolved, and the whole tele-
grapbic apparatus is actuated; and c is the pointer of the receiving instrument,
which is moved by the operation of the wheel b, motion from the shafting a being
transmitted to the pointer by the mechanism illustrated in detail in Figures 3
and 4. This consists of a disc d, having-in the case shewn-two teeth d'; and a
disc d', with notches d³, into which the teeth d¹ enter, and intervening portions d*,
which are engaged by the teeth d. The outer edge of the parts d₁ is concave,
Being of a corresponding curvature to the curve of the periphery of the disc d;
and one of these concave parts coincides and engages with the periphery of d
whenever the teeth are not engaged with the notches d³, as indicated in
Figure 4.
The disc d, as will be seen, is connected with and driven by the shafting and
bevelled wheels; while the disc 2 is fixed upon the pointer spindle c' of the
receiving instrument D.
The apparatus is so adapted and constructed that the actuating wheel b shall
be rotated one complete revolution for each action, i.e., to move the pointer cof
the receiver (and the other pointers) a distance equal to that of the centre of one
order from another; that is to say, one revolution of the wheel & will cause the
receiver and other pointers to be moved exactly from one order to another. As
there are eight divisions and seven orders on the dial of the receiving instru-
ment shewn, to move the pointer cover the whole set of orders on the dial, the
handle or wheel b is revolved six complete revolutions; and to give the amount
of movement of the wheel b to the receiver pointer c, to move it one orders
distance, the amount of movement transmitted to the disc d' by the disc d must
be of that of the former. However, as there is employed in the transmitter
head a bevel gearing a², in which the wheel on the shaft b, driven by the
wheel b, is half the size of the bevel wheel it drives upon the shafting a, the
amount of movement of the shafting a for each action of the wheel b will be
one half of the amount thereof, so that the movement of the shafting a will be
four times as much as the actual movement of the pointer c, in moving from one
order to the other.
This excess of movement of the shafting a insures that the wheel or disc 2 and
pointer c will be moved by the disc d, for each revolution of the wheel b, the full
distance from one order to another, without fail. The position of rest of the wheel b
is with its handle uppermost, and the normal position of rest of the disc d, is that
shewu in Figure 4; by which it is shewn that d may have movement about of a
revolution (ie. of one complete movement) without affecting d. Thus, as will be
seen, in a telegraphic apparatus, defective fitting, back-lash, torsion, and the like,
in the shafting or bevel wheels, and incorrect movement of the transmitter mechanism
or its actuating wheel, may take place, without bringing the chance or probability of
defective action between the disc d and the pointer disc d² within a possibility; as
the degree of revolution of the disc d to move the disc d², the distance from one of
its parts to another, into the position shewn in Figure 4, is only a fraction of the
whole extent of the movement of the shafting a, thereby allowing for large defects
on either side of its normal position of rest, without affecting at all the correct
action of the apparatus.
The action, then, is that the pointer c has to be moved from one order to another,
that is of a circle, while the wheel b is rotated one complete revolution, and by the
movement transmitted to the shafting a (which will be one half of a complete
revolution at the transmitter), the disc d will be rotated some portion of a half
revolution, the amount of movement less than the full half revolution being caused
by back-lash, torsion, defective fitting, etcetera, above referred to; and in this
movement of the disc d (which, in any case, will be much greater than the amount
of movement required to be given to the disc d²), the tooth d¹ of the disc d under

page_text: all circumstances will engage with one of the teeth or parts d' of d², and give it
that relatively small, but positive amount of movement, which is necessary to move
it the distance of the pitch apart of these parts d, and the pointer c from one order
division to another, these parts being removed from each other the same number of
degrees as are the divisions of the receiver dial.
Each action of the disc d by the disc d will, obviously, be sharp or quick; aut
consequently, the pointer c will be sharply moved from one order to another; and
since, after the tooth d leaves the notch d³ of the disc d², the circular edge of the
disc d coincides with the edge of the parts d', the same amount of movement and
position of the pointer c must take place positively each time it is operated, that is,
from the centre of one order it will be moved positively to the exact centre of the
next, both in the backward and in the forward direction, no matter what position
the teeth d of the disc d take after each actuation of that disc; rendering, therefore,
the position of the pointer e not only certain, but also independent of the position
of all the gear between the disc d and wheel b. Further, when the pointer c has
been moved in this manner, it is positively held in the position to which it has been
moved, by the edge of the disc a being coincident with the edge of its parts d¹, so
that at all or any time when one of the teeth d is not engaged with the disc d²,
that disc and the pointer c are positively held in a position from which they cannot
be moved; at the same time leaving the shafting a and disc d free to move.
In transmitting instruments of the kind illustrated in Figure 1, namely, instruments
wherein the upper face or dial e of the instrument and pointer e lie in the horizontal
plane, and the pointer, as well as that in the receiver, is to be actuated, under this
invention, this pointer is operated from the shaft of the wheel b by discs fand fl
of the same nature, and operated in the same manner and extent, as the discs d
and d², above described.
Of these discs, fis on the shaft b', and f¹ is on a secondary shafi f2, which passes
from one side of the instrument to the other; and the movement given to the disc f¹
by the disc is transmitted to the pointer e, through the shaft f2, which is driven
by f, bevel wheels f, and a spindle f4, carrying the pointer e, and the upper
bevel wheel f³.
In this arrangement, the discs f and f¹ are not only used to move the pointer e,
but also serve as a stop mechanism, acting in the same manner as the well known
"Geneva " stop, by which the pointers c, and also e, cannot be moved further than
over the full range of the orders or indications upon the dials. To effect this-
there being 7 orders and 6 movements-the disc " has six recesses and seven
parts fx, the edges of which coincide with the periphery of the disc f; whilst the
part between the adjacent or last portions is left full, and serves as a stopping
part, against which the tooth 1x of comes at the completion of its action in
either direction.
66
4x
Regarding the receiving instrument D, the example given in Figure 1 is provided
with duplex gongs, which for "Ahead" orders give one tone or sound, and for
"
Astern orders give another. This method of giving the differential sound
indications being old, forms in itself no part of this invention, but, under this
invention, in connection with means for operating the pointer described, this duplex
gong actuating device is disposed and arranged in a special position relatively with
the pointer and the transmitting gearing, viz., the shafting a; that is, the strikers
of the gongs, and their operating toothed wheels 12× are interposed between the
pointer c on the one hand, and the pointer actuating device (d2) on the other.
By this means, the sounding of a gong, giving one note or tone, for "Ahead
orders, and the other, giving another note or tone, for "Astern" orders, is rendered
possible, so the gong hammer actuating wheels 12, are only moved the same
amount of relative movement-viz., less than one complete revolution-in the
apparatus being worked from one extreme to the other, i.e. the same amount as that
of the pointer c; whereas, if the gong actuating device were disposed or applied
otherwise, then, this differential toned sound signal could not be made.
As regards the actuation of the pointer of ships telegraphic instrument―

page_text: "
particularly the receiving instrument-in the manner described, that is, by giving
it its full movement, and employing for this purpose only a fraction of the movement
of the shafting or means by which the communications are transmitted, and of
making the movement sharp and certain, and, after actuation, holding it in the
position to which it has been moved, modifications or equivalents of the device
illustrated in Figures 3 and 4, by which this is effected, are shewa in Figures 6
and 7. In Figure 6, the means consist of a ❝ drunken screw mounted on the
shaft and a wheel P, with rollers p' on it, mounted on the pointer shaft c', such
rollers fitting in spaces between the teeth o¹ of o. This screw o-which is a well
known device in itself-has the parts of its threads which give motion to the
wheel p, arranged at a suitable inclination to the axis of the shaft a; while the
other parts of the teeth are disposed in a plane at right angles to the shaft a, so
that when these parts of the teeth are revolving past one of the rollers p', no
movement is given to the wheel p; at the same time such wheel and the pointer c
are kept in the same central position, and cannot be moved.
a,
The modification shewn in Figure 7 consists of a wheel r, with teeth ¹ on it,
mounted on the shaft a; a discs on the pointer shaft c', with projecting studs s¹ on
its face; and a locking pawl t. In this case, at a point in a revolution of the
wheel r, one of its teeth comes in contact with one of the studs s' of s, and move
the shaft c and pointer, a distance from one order to another, the rest of their
stroke having no action upon the disc s, this disc and the shaft c' being held in
position, with the pointer central in its order, after each actuation by the pawl t,
which is mounted on a spring t¹ fixed to the frame of the instrument.
These modifications will suffice to shew that the invention is not restricted as to
the exact form or means of effecting the actions, or manner of operation of, the
pointers of the receiving instrument of ships and like telegraphs, under this
invention.
66
66
The invention above described has been more particularly specified as applied to
ships telegraphic apparatus for communicating between the bridge or deck of a
vessel and the engine room; it is, however, to be stated, that by simple, suitable,
modifications, as to dials, it may be applied to other ships telegraphic purposes, as
steering telegraphs," lookout telegraphs," "turret telegraphs," "stokehold
telegraphs," and analogous purposes; also, it is not restricted to the particular
forms or constructions of parts, and the type of transmitter, receiver, and the
transmission means, set forth with reference to and shewn in the drawings, as
different types and forms thereof may be used or substituted for these.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what
I claim is :-
1. The improvement is ships telegraphic apparatus comprising transmitting and
receiving instruments, and transmission shafting or equivalent means; wherein the
transmitting instrument is constructed and adapted to impart to the transmission
shafting or other means, a movement substantially in excess of that which the
receiving pointer is required to move (for each order or notification transmitted);
and at the receiving instrument a mechanism by which only a fraction of the
movement of the transmitting shafting or means is used to actuate the pointer, and
the rest of the movement conveyed to it by the transmission shafting or means is
inoperative thereon, or free, the pointer being held in position over the dial after
each actuation; operating substantially as set forth for the purposes specified.
2. In a ship's telegraphic apparatus comprising transmitting and receiving instru-
ments, and intermediary transmitting shafting or equivalent means, the combination
of a wheel or crank adapted to be moved one revolution for each order or
notification to be transmitted, and by which the transmission shafting is given a
substantial excess of movement over that required to move the receiving pointer
from one order to another; and mechanism connected with the receiving instrument,
-such as herein described, by which only a fraction of the movement of the

page_text: transmitting shafting or means is used to actuate the pointer, and the rest of the
movement conveyed to it by said transmission shafting is inoperative thereon, or
free, the pointer being sharply moved by said means in moving from order to order,
and held in position over the dial after each actuation; substantially as and for the
purposes set forth.
3. In a ship's telegraphic apparatus comprising a transmitting and receiving
instrument, and wherein the transmission shafting, or equivalent means, has an
amount of movement imparted to it, in excess of that which the receiver pointer
requires to have imparted to it, in each action, in moving from one order to the
other, the employment in combination of a wheel or crank on the transmitting
instrument adapted to be rotated one revolution for each order transmitted, and, in
connection with said receiving instrument, of duplex gongs and striking mechanism,
for the purposes described, interposed between the means by which the fractional
motion is imparted to the pointer from the shafting or the like, and the pointer
itself; substantially as set forth.
4. In a ship's telegraphic apparatus of the kind herein referred to, the employment
in connection with the transmitting instrument, of the mechanism ff, substantially
as described, by which the pointer of said instrument is actuated, and a stop, by
which the limit of movement of the actuating wheel or handle and number of
revolutions thereof, is afforded.
5. The apparatus for ships' telegraphic or analogous purposes, having its parts
combined, arranged, and adapted to operate particularly as set forth with reference
to the drawings.
Dated this 10th day of A mount 1005
CHEESBROUGH & ROYSTON,
15 Water Street, Liverpool, Applicant's Patent Agents.