Improvements in or relating to Marine Engine Telegraphs and similar Devices.
Year: 1894

page_text: Date of Application, 2nd July, 1894
Complete Specification Left, 22nd Mar., 1895-Accepted, 1st June, 1895
PROVISIONAL SPECIFICATION.
Improvements in or relating to Marine Engine Telegraphs and
similar Devices.
I, Boo GUSTAF HJÄRNE, of 46 Storgatan Stockholm, in the Kingdom of
Sweden, Civil Engineer, do hereby declare the nature of this invention to be as
follows:-
In the manoeuvring of engines in steamers it very often happens that misfortune
or danger of misfortune ensues from mistakes in the manoeuvring of the engine,
the engineer making the opposite manoeuvre to that ordered, moving the reversing
gear in the wrong direction. The improved invention has for its object an
arrangement to prevent such mistakes. It will also serve as an automatic answering
telegraph from the engineer to the captain, it will at any moment show the captain
of the position of the engine controlling gear, and it has also the purpose of serving,
as it were, to prove at an eventual dispute, if mistakes in the mancuviing have
been made. It may be arranged in engines furnished with a needle telegraph from
the bridge or from the captains cabin to the engine.
The enclosed drawing shows in Figs. 1-5 a schematic representation of the
arrangement, in Fig. 6 a coupling diagram and in Fig. 7 a detail in plan.
In Fig. 1a is the needle of the telegraph conductive of electricity and insulated
from the telegraphic table. and are two plates of copper or of any other
conductive metal, fastened to the table concentrically with its border. They are
insulated from the table and from each other and lie so high from the table, that a
spring of some conductive metal, fastened to the underside of the needle, drags on
one of the plates when the needle is moved. e, Figs. 1-7, is some part of the
reversing gear, for instance the link, one of the excentric sheaves or rods or the
screw and wheel, the nut or any equivalent arrangement between the excentric
sheaves and the reversing wheel or lever.
To this part e there is fastened a projection or a needle d, Figs. 6-7.
and f¹
are two insulated plates of copper or of some other conductive metal, which are so
placed, that the projection d is in the place between them when the part is in
stop" position.
66
The part being moved to, the engine will go
6
back," when it is moved to "¹
lies to the "back" side, the
strip to the "forwards" side. The spaces between the strips and ƒ respectively
and ought to be as little as possible.
it will go forwards." On the index table the strip
r
is connected with by means of an insulated conducting wire, is connected
in the same way with . Further the needle is connected with the projection d,
and the battery, the bells and are introduced into this lead. is placed in the
engine room, and on the bridge or in the captain's cabin. The bells are
coupled to the lead in such a manner, that their poles are between the battery and
the projection d. The battery is coupled between the needle a and r.
91
In order to show clearly in which direction the telegraph needle or the reversing
gear must be conducted, when "back" or " forwards is to be ordered, the reference
letters B and F have been inserted on the drawing. The manner in which the
apparatus operates is shown by Figs. 1-5.
In Fig. 1 both the engine and the needle are in "stop" position; and the circuit
being broken the bell cannat rim

page_text: In Fig. 2 the needle is standing on "forwards," the engine on “forwards." The
circuit is broken.
In Fig. 3 the needle stands on "back," the engine on "back." The current is
again broken.
In Fig. 4 the needle is standing on
circuit is then closed and the bells ring.
66
forward," the engine on "back." The
In Fig. 5 the needle is standing on "back," the engine on "forward." The circuit
is closed and the bells ring.
The strips and f, respectively and, being very close to each other, the
signal is given just as the wrong reversing has begun, i.e. the engine not yet
beginning to work, and thus there will be time to remedy the fault, before any
harm results.
I
If the projection d is fastened to a link or an excentric sheave or rod, the
strips and ought to be so short, that the projection d at the movement of the
engine never bears upon the strips, in order to avoid unnecessary detrition. If
some piece of the engine having only a movement backwards and forwards is used-
i.e. some part connected with the reversing wheel or lever-the strips ought for the
reason mentioned below to extend so far, that the projection d is always in contact
with one strip except in "stop" position. It may happen if the engine is in "back"
position for instance, and the telegraph theu is moved directly to "forward," that
the bell signals during the time the projection d is dragging to the strip. If the
plates are so long that d is always in contact with one of them during the movement
of the engine, this will cause no difficulty. Then the ringing of the bell signifies
that the engine is in a wrong position and ought to be reversed, and this is also the
intention of the command given. But if the projection d during the movement of
the engine will be out of contact with one strip the bell will begin to ring first.
when d presses to the strip, and this could perhaps cause trouble. To prevent this
difficulty a special apparatus for interruption of the current is shown in Fig. 7,
which is arranged at each of the strips or The drawing illustrates the
arrangement applied to the one of these strips. A piece of metal h h', which is
pivoted at g, mediates the transition of the current from and to those ends of
and which are farthest from the " stop" position. The current is closed.
when the end bears upon the strip and the end h upon a contact spring k
connected with the conducting wire (Fig. 6). The manner of operating is as
follows:-
When the projection d is passing from the "stop" position to the "back
or the
"forward "position, it glides along one of the strips or f When reaching the
farthest end of one of the strips it will catch the one end of the piece, which
at extends beyond the border of the strip, and turns the piece round g so far,
that d may freely pass.
The spring i which is fastened with the one end near to the strip while the other
end is free, has a double bent shape, so that the end 4 that is always bearing upon i,
is pressed to the contact-spring when the current is closed (and at the same
time to the end of the strip) and causes the end when the current is broken off
to be moved somewhat more than what is done by d for the purpose of preventing d
catching the end when it is moved from "back" or "forward" position and thus
make the circuit close or break at the end of the piece h, h
This is effected in such a way that when the projection has carried the piece h
as far away as is shown by dotted lines in Fig. 7, the spring which just in this
position has a sharper inclination, assumes the motion and removes the end h'
somewhat higher up. The piece h, h¹ is by a pivotted rod connected with a similar
piece placed to the end of the strip near to the "stop" position of the projection
and pivoted at o. As shown in Fig. 7 the piece n is arranged at angles with '
in such a way that n and h, are alternately out of contact with the strip. When
the projection d in the transition from "back to ❝ forward " or vice versa, has
passed and comes into contact with the plate, the current is broken off, but when
it catches the under part of and turns it round o, it will close the circuit because
دو

page_text: at the same time the piece h, is brought back to position shown with full lines in
Fig. 7, and because the spring i is pressing h, h¹ to the strip, the under end of n is
lifted so high that there will be no obstacle, when d passes from "stop" to either of
the end positions.
In metal steamers the coupling may be simplified by uniting the one pole of the
bell or with the nearest metallic part of the ship instead of with d. By this
no wire needs to be conveyed to the reversing gear. Likewise only one wire is
conveyed to the bell r and its other pole is united with some metallic part of the
steamer.
Figs. 8 to 13 show a modification of the apparatus.
Instead of one bell r there
are two such, each with a battery e²e introduced into each of the two leads
from the strips of the needle telegraph to the plates of the reversing gear.
Hereby the advantage is gained, that in metallic steamers neither the needle nor
the reversing gear need to be insulated but may be in metallic connection with the
stenmer.
Figs. S to 13 show positions of the needle and of the engine, corresponding to
Figs. 1 to 5. The two bells 7² 7³ may be furnished with the same gong's Fig. 13.
The bell must in this case be replaced by two such,, ; they also if wanted
arranged with the same gong Fig. 13. To prevent the engine being thrown
back," "stop" being commanded from "forward," the needle on the table may
be made that it is, at the "stop" position, in contact with both the strips which are
very near to one another.
66
Dated thin and I.1. 1904
R. HADDAN,
Agent to Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Marine Engine Telegraphs and
similar Devices.
I Boo GUSTAF HJÄRNE, Civil Engineer late of 46 Storgatan, but now of Vestra
Trädgårdsgatan 7 Stockholm in the Kingdom of Sweden 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 :-
The invention relates to an electrical indicator designed more especially for use
on steamers for indicating to the captain the manipulations of the engineer in
response to the captain's signals.
Accidents often happen to steamers through the engineer's inadvertently moving
the reversing gear of the engine in the wrong direction.
My invention has the object to provide an indicating device which at all times
notifies the captain of the position of the reversing gear, thus enabling a mistake on
the part of the engineer to be rectified before any serious accident can occur.
In the accompanying drawings
Figures 1, 2, 3, 4, and 5 are diagramatic views illustrating one form of my
invention.
Figure 6 is a similar view of a modification of the improvement.
Figure 7 is an elevation of a modified construction of the contact devices located
in the engine room.
Figure 8 is an enlarged fragmentary view of the same parts, showing a different
position of the reversing gear of the engine.
Figures 9 and 10 are diagramatic views illustrating a modification of the devices
shown in Figures 1 to 5.
Figure 11 is a similar view of another modification.
Figure 12 is a cross section in line 12-12, Figure 11.

page_text: Figure 13 is a sectional side elevation of the reversing lever of the engine and
the adjacent contacts.
Like letters of reference refer to like parts in the several figures.
In the drawings my improved indicator is shown in connection with the well
known needle telegraph with which steamers are commonly equipped.
Referring to the form of the improvement shown in Figures 1 to 7, A is the
needle of the telegraph located in the captain's cabin or on the bridge and suitably
insulated from its support. and represent two insulated contact plates or
terminals of copper or other conductive material, arranged concentrically with the
needle A and adapted to be traversed by the latter. The needle carries on its under-
side a contact spring adapted to make contact with either of the plates and f, by the
oscillation of the needle on its pivot. The inner ends of these conducting plates
are separated by an intermediate space e opposite which the needle stands when its
spring out of contact with both plates and when the engine reversing gear is in
the "stop" position.
D represents the hand lever or other movable part of the reversing gear of the
engine, and is a contact or metallic spring arranged on said part, so as to move
therewith. and are two insulated contact plates of copper or other conductive
material arranged in the engine room, adjacent to the contact spring d of the
reversing lever, so as to be traversed by said contact spring in moving the reversing
gear in one or the other direction. The contact plates and fare separated at
their inner ends by a space similar to the contact plates in the captain's cabin.
When the engine is at rest, the contact spring of the reversing gear stands
opposite this space, making no electrical connection with either of the adjacent
contact plates.
"back
"
"
For brevity, the contact plates in the captain's cabin will be called "primary
and "forward" 6
"
contacts and the plates in the engine room, the
secondary "back" and "forward" "
thereof will be referred to as the "needle contact
contacts," while the needle or the contact
"and the contact on the lever
66
"
contact
or other movable part of the engine reversing gear as the "engine contact."
g is a conducting wire connecting the primary "back" contact with the secondary
"forward" contact, and g is a wire connecting the primary "forward
with the secondary "back"
contact with the engine contact and L is a battery or electric generator interposed
his a conducting wire connecting the needle
in said wire.
contact.
J is an electric signal bell located in the captain's cabin or on the bridge and
interposed on the wire h, and J' is a similar bell located in the engine room and
preferably interposed in a branch of the wire has shown.
The secondary contacts are so arranged relatively to the engine contact that
when the reversing gear is moved in the proper direction to cause the vessel to move
forward or to back, the engine contact will connect with the corresponding
secondary contact and so that when the reversing gear is in the "
in which the engine is at rest. the engine contact will be disconnected from both
stop position
secondary contacts. The primary contacts are so arranged with reference to the
needle contact that when the needle is moved to the "back or "forward "position 4
it connects with the corresponding primary contact, while when the needle is in
stop" position it makes no contact with either of said primary contacts.
The operation of the apparatus is as follows
the "
"
When the needle is in the "stop" position, and the engine contact is in the
corresponding position, as shown in Figure 1, the electric circuit is open and the
signal bells and J' are not rung, indicating to the captain and the engineer that
the latter has correctly followed the captain's signal.
When the captain gives the signal to go ahead the needle moves upon the
"forward" primary contact and if the engineer correctly follows the signal the
engine contact is moved upon the forward secondary contact, as shown in Figure 2.
The circuit is still open and the signal hells remain silent, indicating to the captain
and the engineer that the latter has properly manipulated the engine.

page_text: Figure 3 shows the reverse position of the needle contact and the engine contact
when the engineer responds properly to the command to "back," the circuit
remaining broken.
"
If, however, the engineer through a misunderstanding or mistake, moves the
reversing gear in the opposite direction to that commanded by the captain,
the circuit is closed, and both signal bells ring, notifying the captain as well as the
engineer that the latter has made a wrong manipulation of the engine, and enabling
the engineer to promptly correct his mistake and the captain to observe by the
movement of the needle whether or not the proper manipulation has been made.
For example, the captain signals "forward and the engineer moves the reversing
gear to "back"
as shown in Figure 4. The needle being now upon the "forward
primary contact and the engine contact upon the "back secondary contact, the
circuit is closed through the needle contact, forward primary contact, wire ',
"back"secondary contact, reversing lever D and wire h, signal bells J and J, an i
battery L, thereby causing the signal bells to ring and indicating the mistake.
A similar effect is produced if the engineer inadvertently moves the reversing gear
to forward" when signalled to "back," as shown in Figure 5.
15
"
The primary and secondary contacts are arranged closely together so that a
comparatively small movement of the needle and engine contacts is required for
changing the relation of the primary and secondary contacts. The error signal is
by this means given at the moment the wrong reversal of the engine takes place
and before the reversing gear has been moved far enough to effect the engine, thus
affording sufficient time to correct the mistake before any harm can result. If my
improved indicator is used on a metallic ship, the electric circuit may be simplified
by connecting one pole of each of the signal bells and the engine contact with the
nearest metallic part of the ship as shown in Figure 6.
When the reversing gear contact is located upon some part which is stationary
during the working of the engine, such as the reversing lever, as shown in
Figures 1 to 5, the secondary contact should be so long that the engine contact is
always in contact with one or the other of the same, except in the intermediate or
stop position of the reversing gear.
When the engine contact is connected with a part of the reversing gear which
moves during the working of the engine, such as the hand lever or link of the well
known link-motion reversing gear shown in Figure 7, the secondary contacts are
preferably so short that the engine contacts clears or inoves beyond the same in the
forward" and back positions of the reversing gear for the purpose of preventing
unnecessary wear of these contacts.
If such short engine contacts were employed in connection with the apparatus
shown in Figures to 5, and the reversing gear were for instance, in the back
position out of contact with the back engine contact, and the needle were then
inoved to the "forward" position, the circuit would be closed, and both signal bells
would ring during the time that the reversing gear contact passed over the back
contact in moving to the "forward" engine contact. This might cause trouble
or confusion. The condition of the apparatus in which this action would occur is
illustrated by Figure 4. The same effect would take place in reversing the engine
from "forward" to "back."
To prevent this difficulty with the use of such short secondary contact plates a
switch or circuit breaker is combined with each of these plates in such a manner
that the circuit is automatically broken in the interval during which the engine
contact glides over the adjacent contact plate in passing to the opposing contact
plate. A device by which this is accomplished is shown in Figures 7 and 8.
device is constructed as follows:-
This
Adjacent to the outer end of each secondary contact plate are pivoted metallic
switch levers kk, the lower arm of each of which is adapted to bear against the
contact plate or to swing clear of the same so as to break the connection.
represent contact springs arranged adjacent to the upper arms of the switch

page_text: levers and adapted to make contact therewith when the levers swing against
the secondary contact plates, and 23 are wires which connect said springs with
the primary contacts respectively mm² are shifting levers pivoted at the inuer
ends of the secondary contact plates and having their upper arms connected
respectively with the corresponding arms of the switch levers hy rods m². The
latter and the shifting levers are constructed of insulating material. The lower
arms of the shifting and switch levers are so long as to project into the path of the
engine contact, when in their normal or upright position, so that they are struck
and swung on their pivot by said contact in shifting the latter beyond the outer en 1
of either of the secondary contact plates. The connecting rods m² are of such a
length that when the switch levers connect the contact plates with the springs,
as shown in Figure 8, their shifting levers are deflected or swung at an angle out
of the path of the engine contact, while when the shifting levers project into the
path of the engine contact the switch levers are swung clear of the secondary
contact plates and said springs, as shown in a part of Figure 7.
"
When the needle and the engine contacts are in the "stop position, both
shifting levers are swung clear of the engine contact, as shown in Figure 8, and
the switch levers project into the path of said contact, and hear against the
secondary contact plates and the springs, thus connecting said plates with the
primary contacts. Let it be assumed that the engineer is signaled to go "forward"
and that he acts accordingly. The engine contact in moring to the "forward"
position shown in Figure 7, encounters the projecting switch lever at the outer end
of the corresponding contact plate and deflects it to the position shown in said
figure, thereby breaking the connection between said contact plate and the
spring and causing the corresponding shifting lever to be swung into the path of
the engine contact. Assume now that the engineer is signaled to "back and that
he moves the reversing gear in the proper direction. The engine contact in moving
from the position shown in Figure 7 to its opposite position beyond the opposing
"back" contact, first strikes the projecting shifting lever and deflects it to the
position shown in Figure 8, causing it to return the switch lever connected
therewith to its former position in which it makes connection with the "forward"
contact plate. Before the switch lever restores this connection, the engine contact
will have cleared the "forward contact plate, as shown by full lines in Figure 8,
and the circuit, has, therefore, remained open during the connection of the engine
contact with said contact plate, thus obviating the ringing of the signal bells and
indicating that the engineer has acted according to instructions. As the engine
contact continues its movement toward and past the "back" contact plate it strikes
and deflects the projecting switch lever of that plate in the same manner as it did
the other switch lever during its previous reverse movement, thus interrupting the
connection between the "back contact plate and the adjacent spring and
preventing the ringing of the signal bells during the next movement of the
reversing gear in the opposite direction. The switch levers are thus alternately
caused to connect the primary and secondary contacts by the deflection of their
shifting levers, and the latter are in turn returned to their operative position by the
deflection of the switch levers.
In order to swing the lower arms of the switch levers upward sufficiently to
prevent the engine contact from striking said arms on its reverse movement, a
shifting spring is arranged to bear against the upper arm of each lever. These
springs are so bent that they are strained or deflected by the swing of the lever
until the engine contact has passed by the lever, when by their reaction they swing
the lever still further in the same direction, whereby it is amply raised out of
reach of the reversing gear contact. The springs n also serve to hold the switch
levers yieldingly against the secondary contacts.
The modified apparatus just described is unnecessary if the secondary contacts
are made so long, that one or the other is always in connection with the engine
contact during the working of the engine, but in that case the engine contact

page_text: would constantly rub against such contact plates, except in the stop position of the
reversing gear, and rapidly wear out the same.
In the modification of the apparatus shown in Figure 9, two indicator circuits
are employed and two signalling bells and a battery are located in each circuit.
On metallic steamers this arrangement has the advantage that neither the needle
nor the reversing need be insulated, but may be in metallic connection with the
steainer.
If desired two gongs or bells may be employed in place of four bells in the
apparatus shown in Figure 9, one gong being located in the captain's cabin or on
the bridge and the other in the engine room. In this case two bell hammers
connected with the armatures of the electro-magnets are arranged to strike opposite
sides of the same goug.
"
“
In order to sound the error signal in case the reversing gear is moved from
fornard to "back or vice versa, when the stop signal is given the telegraph
needle may be arranged to bridge both primary contacts when it stands in the
stop" position so as to circuit when such a mistake is made. Such an arrange-
ment is shown in Figures 11, 12 and 13 in which o and o' represent the insulated
primary contact plates mounted on a suitable base board o². p is an insulated
auxiliary contact plate which is arranged concentrically within the primary
contacts. This auxiliary plate has a lug or radial projection y which is arranged
between the inner ends of the primary contacts and with which is connected the
wire ' in which the signal bells J J and the battery L are interposed. When
the steamer is metallic, one pole of each bell is connected with the nearest metallic
part of the same, as shown.
The needle is in this modification provided with a metallic arm which is
insulated by washers from the needle, as shown in Figure 12, and which carries
two contact brushes and 3. The brush 73 bears upon the primary contacts o
and o' and is broad enough to bear upon then both when the indicator needle
thus
points to "stop" while the other brush bears upon the auxiliary contact
forming an electric connection between the needle arm r and the battery Land
bells J J'.
P,
S and S¹ are the secondary contact plates and D' is the band lever or other part
of the engine reversing gear which carries the engine contact d'. The secondary
contacts are insulated from the reversing gear. and are the wires which
councct the primary and secondary contacts. The reversing lever is connected
with a metallic part of the steamer by the wire 2, as shown, so that the steamer
forms an electric connection between the signal bells and the reversing gear.
"
When the arm of the needle is moved into the "stop" position and the engineer
in accordance with the signal given shifts the reversing gear into that position, the
circuit is broken between the secondary contacts S and S' and the error signal is
not sounded. If however, the engineer should move the reversing gear from
" back
to "forward" or vice versa instead of to the " stop" position, the circuit
will be closed, and the error signal sounded, the circuit being in that case
completed through the needle arm, one or the other primary contact, the auxiliary
contact, the wire ', battery L, signal bells J J1, the steamer, the reversing lever,
the secondary contact with which the latter connects, and the wires and s which
connects said contact, with the corresponding primary contact.
The apparatus just described also illustrates practical application of the first
described apparatus shown in Figures 1 to 5, the only difference being that in the
first described apparatus the auxiliary contact plate p would be omitted.
The needle telegraph is not fully shown and it will be understood that the same
is of the well known construction and that the needle arm in addition to its usual
function, performs the function of a circuit closer for the indicating apparatus.
My improved indicator though shown and described in connection with a needle
telegraph is not confined to use in that relation, but any other suitable circuit
closer or switch device may be combined with it in place of the pivotal needle.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion, and in what mauner the same is to be performed I declare that what I
claim is :―
"
1. In an electric indicator the combination with two primary contacts and a
switch or switch needle, adapted to connect with either one of said conduits, and
having a position intermediate without connecting with either, of two secondary
contacts of which the one on the right side (for the "forward signal) is
electrically connected with the one of said primary contacts on the left side (for
the "back" signal) and vice versu, a switch contact carried by a movable part
whose position is to be determined, and adapted to connect with either one of said
secondary contacts and having an intermediate position without connecting with
either, electric signalling apparatus interposed in the said electric circuits, between
the said primary contacts and the said secondary contacts, and electric generators
in the said circuit or circuits substantially as set forth.
2. In an electric indicator the combinations with primary contacts and a switch
or switch-needle adapted to electrically connect with either cne of said contacts
and to have an intermediate position without making contact with either, of two
secondary contacts, of which the right side one (for the "forward" signal) is
electrically connected with the left side one (for the "back" signal) of the said
primary contacts and vice versa, a switch contact carried by a movable part, whose
position is to determined and adapted to electrically connect with either one of
said secondary contacts and having an intermediate position where it does not
connect with either, and electrically connected with said needle contact, electric
signalling apparatus interposed in the said circuit that connects the said needle and
the said switch contacts and an electric generator in the circuit or circuits,
substantially as and for the purposes set forth.
3. In an electric indicator for ships, the combination with two primary contacts
and the needle of a needle telegraph adapted to electrically connect with either
one of said contacts and to have an intermediate position when it does not connect
with either of two secondary contacts located in the engine room of the ship and
of which the one on the right side (for the "forward" signal) is electrically
connected with the left side one (for the back signal) of the said primary contacts
and vice versa, a switch contact carried by a part of the reversing gear of the
engine and electrically connected to the said needle and adapted to connect with
either one of said secondary contacts and having an intermediate position in which
it does not connect with either electric signalling apparatus interposed in the said
circuits between the primary and secondary contacts and electric generators in the
circuits substantially as and for the purposes set forth.
4. In an electric indicator for ships, the combination with two primary contacts
and the needle of a needle telegraph adapted to electrically connect with either
one of said contacts and to have an intermediate position, where it does not connect
with either, of two secondary contacts located in the engine room of the ship and
of which the one on the right side (for the "forward" signal) is electrically
connected with the left side one (for the "back" signal) of the said primary
contacts and vice versa, a switch contact carried by a part of the reversing gear of
the engine and electrically conuected to the said needle and adapted to connect
with either one of said secondary contacts and having an intermediate position in
which it does not connect with either, electric signalling apparatus interposed in
the said circuit between the said needle and switch contact, and electric generators
in the circuits substantially as and for the purposes set forth..
5. In an electric indicator the combination with two primary contacts and a
switch or switch needle adapted to connect with either one of said primary contacts
but suitably arranged so as to always connect with them both when is in the
central position, of two secondary contacts each electrically connected with the
reverse of the said primary contacts, a switch contact carried by a movable part,
whose position is to be determined, and adapted to connect with either one of said

page_text: secondary contacts and electrically connected with said needle contact, electric
signalling apparatus interposed in the circuits between the said primary contacts,
and the said secondary contacts, electric generators interposed in the same circuit
as the said signalling apparatus substantially as set forth.
6. In an electric indicator the combination with two primary contacts and a
switch needle adapted to connect with either one of said primary contacts, but
suitably arranged so as to always connect with them both, when it is in the central
position, of two secondary contacts electrically connected with the reverse of the
said primary contacts, a switch contact adapted to connect with either one of said
secondary contacts and carried by a movable part, whose position is to be
determined, electric signalling apparatus, interposed in the circuit between the said
switch contacts and an electric generator in the same circuit as the signalling
apparatus, substantially as set forth.
7. In an electric indicator for ships, the combination with two primary contacts
and the needle or a needle telegraph, adapted to connect with either one of said
primary contacts, but suitably arranged so as to always connect with them both,
when it is in the central position of two secondary contacts adapted to be located
in the engine room of the ship and electrically connected with the reverse of said
primary contacts, a switch contact electrically connected with said needle, carried
by a part of the reversing gear of the engine and adapted to connect with either
one of said primary contacts, electric signalling apparatus interposed in the said
circuits between the said primary contacts and the said secondary contacts and
electric generators interposed in the same circuits as the said signalling apparatus,
substantially as set forth.
8. In an electric indicator for ships the combination with two primary contacts,
and the needle of a needle telegraph, adapted to connect with either one of said
primary contacts, and adapted to always connect with them both in its central
position, of two secondary contacts adapted to be located in the engine room of the
ship and electrically connected with the reverse of the said primary contacts, a
switch contact carried by a part of the reversing gear of the engine and adapted
to connect with either one of said secondary contacts electrical signalling apparatus
interposed in a circuit which connects the said needle and the said switch contact,
and an electric generator in the same circuit as the said signalling apparatus
substantially as set forth.
of Monah 1805
R. HADDAN,
Of the Firm of Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, Agent for Applicant.