IMPROVEMENTS IN APPARATUS FOR MEASURING AND RECORDING THE SPEED AT WHICH VESSELS ARE PASSING THROUGH THE WATER, ALSO APPLICABLE TO MEASURING AND RECORDING THE SPEED AT WHICH STREAMS OR CURRENTS ARE FLOWING
Year: 1881

page_text: ETTERS PATENT to Cornelius Edward Kelway and Frank Dyer, both of
40, Southampton Buildings, Chancery Lane, in the County of Middlesex, for
an Invention of "IMPROVEMENTS IN APPARATUS FOR MEASURING AND
RECORDING THE SPEED AT WHICH VESSELS ARE PASSING THROUGH THE
WATER, ALSO APPLICABLE TO MEASURING AND RECORDING THE SPEED AT
WHICH STREAMS OR CURRENTS ARE FLOWING"
PROVISIONAL SPECIFICATION left by the said Cornelius Edward Kelway
and Frank Dyer at the Office of the Commissioners of Patents on the
15th November 1881.
CORNELIUS EDWARD KELWAY and FRANK DYER, both of 40, Southampton
Buildings, Chancery Lane, in the County of Middlesex. "IMPROVEMENTS IN
APPARATUS FOR MEASURING AND RECORDING THE SPEED AT WHICH VESSELS
ARE PASSING THROUGH THE WATER, ALSO APPLICABLE TO MEASURING AND
RECORDING THE SPEED AT WHICH STREAMS OR CURRENTS ARE FLOWING."
This Invention relates more especially to apparatus used for the purpose of
measuring and recording the speed at which ships or other vessels are passing
through the water, and the distance passed over by them, and it has for its objects
improvements in the construction and arrangement of such apparatus whereby its
indications are more reliable and more easily observed, and it is more readily
adjusted in its position and accessible when required than such apparatus as
heretofore ordinarily constructed and used.
Our present Invention relates more particularly to further improvements in the
apparatus for which Cornelius Edward Kelway obtained Her Majesty's Royal
Letters Patent, dated June 12th, 1877, and numbered 2292, for "Improvements in
Apparatus for Ascertaining the Rate at which Vessels are Passing through the
Water, also Applicable to Ascertaining the Rate at which Streams or Currents are
Flowing," in the Specification and Drawings of which Letters Patent methods are
described and shewn in which the apparatus is supported in a tube attached to the
Dis 0.31

page_text: ship, and the indications are conveyed by means of electricity to any convenient
position within the ship and are there recorded.
For the purpose of measuring and indicating speed the ship's log in ordinary use
consists of a rotating apparatus having helically arranged blades, which is drawn
through the water and thus made to revolve, its rotations being communicated to
wheel-work contained in a suitable box or case.
The wheel-work indicates upon suitable dial plates the number of revolutions of
the helical blades, and consequently when their helical " 'pitch" is accurately
adjusted to the indications upon the dial plates the speed at which the ship or
other vessel is moving.
Our present Invention consists, first, of improved methods of constructing and
arranging the rotating apparatus or log and the frame which carries it as well as
the support in which the frame is arranged in such manner that the entire
apparatus is simple and occupies little room, whilst it can be easily adjusted either
in the position in which it is set in operation and its indications recorded, or in
that in which it is withdrawn into the ship and kept secure from injury until again
required.
At a suitable part of the ship's bottom, preferably at or near the centre of its
length, we make an opening, preferably rectangular, and in a position transversely
across the ship, and above this opening we fix a frame carrying a slide valve
operated when desired from within the ship, by which the opening may be entirely
opened when desired or closed so as to be watertight.
Above this valve we fix a vertical case of iron, gun metal, or other sufficiently
strong material, having an opening through it corresponding in shape and size
_ with that-through-the-bottom-of the-ship, and-we close the-upper-end-of-this-
vertical case by a cover of iron, gun metal, or other sufficiently strong material,
attached by bolts or screws.
The vertical case forms therefore a hollow recess in the ship rectangular in plan,
and the lower end of which can be opened or closed to the external water as
desired by means of the slide valve.
Within this case we arrange and fit, so that it can be readily moved up and down,
a frame which carries the log.
This second frame consists of a hollow rectangular box or cage of iron, gun metal,
or other sufficiently light and strong material, the lower end of which has attached
to it or forming part of it a cylindrical tube, the length of which is equal to that
of the recess first described, in the direction of the length of the ship, whilst its
external diameter is equal to the width of the recess across the ship. When
therefore the valve is opened and the frame is lowered into the water through the
valve its lower end forms a short horizontal tube, the opening through which is in
the direction of the length of the vessel, whilst its upper part fits the lower part
of the recess in the vertical case. When the frame is raised into the case the
valve can be shut and access can then be had to the interior of the recess if
desired.
The front and back ends of the cylindrical tube described are open, with the
exception of a narrow transverse bar, in each of which is formed a central bearing,
preferably of lignum vitoe, screwed into a boss in the bar, in which bearings
revolves a spindle carrying two or more helical blades, which are therefore capable
of revolving in the tube.
The spindle also carries a small endless screw, which gears into and drives a
horizontal worm wheel upon a vertical axle, the lower end of which revolves in a
similar bearing carried by one of the cross bars, whilst its upper end revolves in a
similar bearing in a box or case formed in or fitted in the upper part of the
moveable frame. This box or case contains toothed wheels and pinions, or endless
screws, revolving upon axles and having the number of their teeth so arranged in
relation to the pitch and consequent speed of rotation of the helical blades that one
of the wheels makes one revolution when the ship or vessel has passed through
one mile, knot, or other determined unit of measurement.

page_text: We prefer to make the helical revolving blades or the spindle which carries them
capable of moving for a short distance in the direction of the length of the latter,.
and to connect them to the endless screw by a clutch in such manner that if the
direction of the vessel's motion be reversed, the revolving blades shall be dis-
connected from the endless screw, which ceases to revolve until the forward
movement of the vessel is resumed.
The moveable frame may, if desired, be provided with a joint so that the tube
in which the helical blades revolve may have a horizontal position, even in cases
where the keel of the vessel is not horizontal. In the box or case which contains
the wheels, as above described, we arrange a vibrating lever of a kind somewhat
similar to that described and shewn in the Specification and Drawing already
herein before referred to, so that as the wheel indicating one mile, knot, or other
unit revolves, teeth or projections upon it actuate at intervals the end of the lever,
the other end of which makes at corresponding intervals electrical connection
between the end of an insulated wire which is brought into the box or case from
any desired part of the ship.
Instead however of using a second insulated wire within the box or case to
complete the circuit of such electrical current, we use the metal frame of the
apparatus itself in order to conduct the electrical current to the desired part of the
ship where the indications are to be recorded.
In order to complete the electric circuit by which the indications are transmitted
from the log, we sometimes arrange flexible parallel springs through which the
circuit is completed when their ends are in contact, and upon the inner end of the
lever which is actuated by the projections upon the wheel in the log as already
described we make a projection or stud, which every time that the lever is released'
by the wheel passes under or over a stud upon one or other of the springs,
which are thus brought into contact as the lever passes, and completes the electric
circuit.
The end of the lever or the projection upon it is twisted or made flexible, or
jointed, so that during the return of the lever it does not bring the springs into
contact. Upon the spindle of the wheel which actuates the lever we arrange a
ratchet wheel having as large a number of teeth as conveniently possible, and
provided with a pall or detent, so that the ratchet wheel is prevented from moving
backward.
In the cover which closes the top of the vertical case as described we make a
stuffing box, through which passes a strong rod or spindle, the lower end of which
is attached to the movable frame which carries the log and indicating apparatus,
whilst its upper end has formed upon or connected to it a screw actuated by a nut
or a toothed rack actuated by a pinion or other device by which the frame can be
raised or lowered in the upper case as desired, without the admission of water into
the ship when the valve is open.
The insulated wire by which an electric current is passed, as described from the
indicating apparatus to the interior of the ship or vessel, traverses the box or case
containing the indicating apparatus, and also the cover by which the top of the
vertical case is closed, by means of stuffing boxes containing rings of india rubber
or other sufficiently soft material surrounding the insulated wire, and pressed
together and held down by screwed glands.
The insulated wire between the stuffing boxes is of such length that when the
moveable frame is lowered into the water in the manner described the wire is not
unduly stretched, whilst when the movable frame is raised into the vertical case
the insulated wire coils or folds itself into a space left between the top of the
moveable frame and the cover of the case, or into a space left in the upper part of
the movable frame itself, and the position into which it so places itself may be
regulated by a spring of any suitable kind.
The lower part of the vertical case may be provided with a cock, valve, or
gauge, by means of which it can be ascertained whether water is leaking through
the valve when the latter is closed, or by which any such water can be drawn off.

page_text: The action of the entire apparatus constructed and arranged as described is
as follows: If the ship or vessel be moving through the water and it is desired to
ascertain the speed at which it is so moving, the valve in the ship's bottom is
opened, and the moveable frame carrying the revolving blades and the indicating
apparatus is lowered through the opening by means of the spindle attached to its
upper end and passing through the stuffing box.
The insulating wire at the same time uncoils or unfolds so as to allow the descent
of the frame.
As the horizontal tube at the lower end of the moveable frame passes through
the water the helical blades revolve at a corresponding speed, and transmit
indications of their revolutions to the wheels in the box, by one of which electrical
contact is made and broken as described in the insulated wire at intervals varying
according to the speed of the ship.
An electrical current is accordingly made at similar intervals through the
insulated wire, the metallic frame, and indicating or recording apparatus in any
convenient part of the ship, by means of a suitable battery or generator of electricity
arranged in any convenient part of the circuit..
If an electric battery be used, in order to provide for a continuous supply of
electricity, we prefer to use two such batteries from which the current is supplied
alternately, so that when one battery is in use the other can be withdrawn, or
replenished and renewed.
And in order to prevent the possibility of contact and consequent indications
being made by such change, we arrange a wheel actuated by the apparatus and
having conducting segments in or attached to it in such manner-that-the current
-from-one or other of the batteries is constantly passing through it and connected
with the circuit of the insulated wire.
When the observations have continued sufficiently long, the moveable frame is
drawn up into the vertical case, the insulated wire coiling or folding itself into the
space above the frame and the valve is closed.
The cover may then be removed if
desired, and access obtained to the apparatus without difficulty or danger of the
entrance of water.
If, as is sometimes the case, it is desirable that the officer or other person in
charge on board the vessel should be called after a certain distance has been run by
the latter, we adopt the following arrangement :-
We arrange a moveable needle or index above the dial plate which indicates the
distance run in such manner that when an index hand actuated by the intermittent
currents of electricity produced as described comes in contact with the moveable
needle or index, such contact completes an electric circuit, which rings a bell or
other sounding apparatus in any of the ordinary well understood ways.
The moveable needle or index being set therefore at a sufficient distance in
advance of the index hand, the contact is only made after the latter has travelled
through a space which is dependent upon the number of times it has been actuated
through the insulated wire from the log, and consequently the distance over which
the vessel has passed.
Apparatus constructed as described may be used for measuring and indicating
the speed of streams or currents of water, and consequently the quantity of water
flowing through them in a given time.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Cornelius Edward Kelway and Frank Dyer in the Great Seal
Patent Office on the 15th May 1882.
CORNELIUS EDWARD KELWAY and FRANK DYER, both of 40, Southampton
Buildings, Chancery Lane, in the County of Middlesex. "IMPROVEMENTS IN
APPARATUS FOR MEASURING AND KECORDING THE SPEED AT WHICH VESSELS
ARE PASSING THROUGH THE WATER, ALSO APPLICABLE TO MEASURING AND
RECORDING THE SPEED AT WHICH STREAMS OR CURRENTS ARE FLOWING."
This Invention relates more especially to apparatus used for the purpose of
measuring and recording the speed at which ships or other vessels are passing
through the water and the distance passed over by them, and it has for its objects
improvements in the construction and arrangement of such apparatus, whereby its
indications are more reliable and more easily observed, and it is more readily
adjusted in its position and accessible when required than such apparatus as
heretofore ordinarily constructed and used.
Our present Invention relates more particularly to further improvements in the
apparatus for which Cornelius Edward Kelway obtained Her Majesty's Royal
Letters Patent, dated June 12th A.D. 1877, and numbered 2292, for "Improvements
in Apparatus for Ascertaining the Rate at which Vessels are Passing through the
Water, also Applicable to Ascertaining the Rate at which Streams or Currents are
Flowing," in the Specification and Drawings of which Letters Patent, methods
are described and shewn in which the apparatus is supported in a tube attached
to the ship, and the indications are conveyed by means of electricity to any
convenient position within the ship, and are there recorded. For the purpose of
measuring and indicating speed the ship's log in ordinary use consists of a rotating
apparatus, having helically arranged blades, which is drawn through the water and
thus made to revolve, its rotations being communicated to wheel work contained
in a suitable box or case. The wheel work indicates upon suitable dial plates the
number of revolutions of the helical blades, and consequently, when their helical
pitch" is accurately adjusted to the indications upon the dial plates, the speed at
which the ship or other vessel is moving. Our present Invention consists, tirst, of
improved methods of constructing and arranging the rotating apparatus or log and
the frame which carries it, as well as the support in which the frame is arranged,
in such manner that the entire apparatus is simple and occupies little room, whilst
it can be easily adjusted either in the position in which it is set in operation and
its indications recorded, or in that in which it is withdrawn into the ship and
kept secure from injury until again required. At a suitable part of the ship's
bottom, preferably at or near the centre of its length, we make an opening,
preferably rectangular and in a position transversely across the ship, and above
this opening we fix a frame carrying a slide valve, operated when desired by a
wheel or handle from within the ship, by which the opening may be entirely
opened when desired, or closed so as to be watertight.
Above this valve we fix a vertical case of iron, gun metal, or other sufficiently
strong material, having an opening through it corresponding in shape and size with
that through the bottom of the ship, and we close the upper end of this vertical
case by a cover of iron, gun metal, or other sufficiently strong material attached
by bolts or screws. The vertical case forms therefore a hollow recess in the ship,
rectangular in plan, and the lower end of which can be opened or closed to the
external water as desired by means of the slide valve. Within this case we arrange
and fit freely, so that it can be readily moved up and down a frame which carries

page_text: the log. This second frame consists of a hollow rectangular box or cage of iron, gun
metal, or other sufficiently light and strong material, the lower end of which has
attached to it, or forming a part of it, a cylindrical tube, the length of which is
equal to that of the recess first described in the direction of the length of the ship,
whilst its external diameter is equal to the width of the recess across the ship.
When therefore the valve is opened and the frame is lowered into the water
through the valve described, its lower end forms a short horizontal tube, the
opening through which is in the direction of the length of the vessel, whilst its
When the frame
upper part fits the lower part of the recess in the vertical case.
is raised into the case the valve can be shut, and access can then be had to the
interior of the recess if desired without the entrance of water.
The front and back ends of the cylindrical tube described are open, and across
them are fixed narrow transverse bars, in each of which is formed a central
bearing, preferably of lignum vitæ screwed into a boss in the bar, in which
bearings revolves a spindle carrying two or more helical blades which are therefore
capable of revolving in the tube. The spindle also carries a small endless screw
which gears into and drives a horizontal worm wheel upon a vertical axle, the
lower end of which revolves in a similar bearing carried by one of the cross bars,
whilst its upper end revolves in a similar bearing in a box or case formed in or
fitted in the moveable frame. This box or case contains toothed wheels and
pinions or endless screws revolving upon axles, and having the number of their
teeth so arranged in relation to the pitch and consequent speed of rotation of the
helical blades that one of the wheels makes one revolution when the ship or vessel
has passed through one mile, knot, or other determined unit of measurement.
--We-prefer-to-make the helical revolving blades or the spindle which carries them
capable of moving for a short distance in the direction of the length of latter, and
to connect them to the endless screw by a clutch in such manner that if the
direction of the vessel's motion be reversed the revolving blades shall be discon-
nected from the endless screw which ceases to revolve until the forward movement
of the vessel is resumed. The moveable frame may, if desired, be provided with
a joint, so that the tube in which the helical blades revolve may have a horizontal
position even in cases where the keel of the vessel is not horizontal.
In the box or case which contains the wheels, as above described, we arrange a
vibrating lever of a kind somewhat similar to that described and shewn in the
Specification and Drawing of the Letters Patent of Cornelius Edward Kelway
already herein before referred to, so that as the wheel indicating oue mile, knot, or
other determined unit revolves, teeth or projections upon it actuate at intervals
the end of the lever, the other end of which makes at corresponding intervals
electrical connection between the end of an insulated wire which is brought into
the box or case from any desired part of the ship.
Instead however of using a second insulated wire within the box or case to
complete the circuit of such electrical current, we use the metal frame of the
apparatus itself in order to conduct the electrical current to the desired part of the
ship where the indications are to be recorded.
In order to complete the electric circuit by which the indications are transmitted
from the log, we sometimes arrange two flexible parallel springs through which
the circuit is completed when their ends are in contact, and upon the inner end of
the lever which is actuated by the projections upon the wheel in the log, as already
described, we make a projection or stud, which every time that the lever is released
by the wheel passes under or over a stud upon one or other of the springs which
are thus brought into contact as the lever passes and complete the electric circuit.
The end of the lever or projection upon it is twisted or made flexible or jointed, so
that during the return of the lever it does not bring the springs into contact. In
the cover which closes the top of the vertical case, as described, we make a stuffing
box through which passes a strong rod or spindle, the lower end of which is
attached to the moveable frame which carries the log and indicating apparatus,
whilst its upper end has formed upon or connected to it à screw actuated by a nut,

page_text: or a toothed rack actuated by a pinion or other device by which the frame can be
raised or lowered in the upper case as desired without the admission of water into
the ship when the valve is open.
The insulated wire by which an electric current is passed, as described, from the
indicating apparatus to the interior of the ship or vessel, traverses the box or case
containing the indicating apparatus, and also the cover by which the top of the
vertical case is closed, by means of stufling boxes containing rings of india rubber
or other sufficiently soft material surrounding the insulated wire, and pressed
together and held down by screwed glands.
The insulated wire between the stuffing boxes is of such length that when the
moveable frame is lowered into the water in the manner described, the wire is not
unduly stretched, whilst when the moveable frame is raised into the vertical caso
the insulated wire coils or folds itself into a space left between the top of the
moveable frame and the cover of the case, or into a space left in the upper part of
the moveable frame itself, and the position into which it so places itself may be
regulated by a spring of any suitable kind.
The lower part of the vertical case may be provided with a cock, valve, or
gauge, by means of which it can be ascertained whether water is leaking through
the valve when the latter is closed, or by which any such water can be drawn off.
A similar cock or valve may be provided at the upper part of the case.
at c.
The accompanying Drawings are in illustration of our Invention. Figures 1
and 2 are vertical sections through the apparatus, and Figure 3 is a section on a
larger scale of the cylinder and rotating apparatus. a is the bottom of the ship
having an opening, above which is fixed the sluice valve bactuated by a handle
Above the valve is fixed the hollow case d corresponding with the opening
through the valve b. A cover e is fixed at the upper end of the case d, which it
closes so as to be watertight. f is the frame which can be moved up and down in
the case d by the screw g working in the nut h, and passing through the stuffing
box in the cover e, so that it can be turned as desired by a wheel or handle
at ; or a rack and pinion or other equivalent means may be used. is the
cylindrical tube, open at its ends, which are provided with cross bars m, m³, having
central bearings n, n', in which revolves in adjustable lignum vitae bearings, the
spindle o carrying two or more helical blades p. The spindle o also carries tho
endless screw which drives the worm wheel s upon the spindle t, the lower end of
which revolves in the bearing u carried by the cross bar m', its upper end
revolving in a similar bearing in the box or case v fitted in the frame f. This box
or case is shewn on a larger scale in Figures 4, 5, and 6, and is fitted with toothed
wheels and pinions 1, 2, 3, &c., revolving in bearings 4, 5, 6, &c., so that one of the
wheels 3 makes one revolution every time the ship or vessel has travelled one mile,
knot, or other determined unit of measurement. The helical blades p are shewn
arranged and fixed upon a central ball w which revolves freely and can move
endways upon the spindle o, and is provided with a toothed clutch at x gearing
into the corresponding clutch y which drives the spindle o and screw r, so that if
the vessel should move backward the clutches are disengaged and the spindle o
does not revolve. The blades are preferably made capable of slight adjustment
of their pitch. 7 is a wheel having ratchet shaped teeth which operate the lever 8
turning upon a centre 9, the other end of which is provided with a screw 10
having preferably a platinum tip which is forced by a spring 11 against the
insulated metallic contact piece 12, preferably of platinum.
The piece 12 is in metallic connection with the wire 13 which is led from the
box through the stuffing box 14, and after traversing loosely the case d passes out
through the second stuffing box in the cover e. The part of the case v containing
the contact piece 12 is closed by a watertight cover, and is separated from the
other part by a division through which the lever S passes, a tube of india rubber or
other suitable flexible material being attached to the lever 8, and to the division
as shewn, so as to allow the movement of the lever without the entrance of water.
The outer end of the insulated wire 13 is conducted to the indicating and recording

page_text: apparatus in the ship. 15 is a ratchet wheel provided with a spring pall to prevent
the wheel 7 from turning in the wrong direction. A is a cock or gauge shewing
the height of water in the case d. The action of the entire apparatus is as
follows: If the ship or vessel is moving through the water, and it is desired to
ascertain the speed at which it is so moving, the valve b is opened, and the frame
or cage carrying the tube and the revolving helical blades and indicating
apparatus is lowered into the water by means of the screw g and the stuffing box i.
The insulated wire 13 at the same time uncoils or unfolds sufficiently to allow the
descent of the frame f.
As the horizontal tube at the lower end of the cage f passes through the water,
the helical blades revolve at a corresponding speed, and transmit indications of
their revolutions to the wheels in the case v, and by means of the wheel 3 electrical
contact is instantaneously made, as described in the insulated wire 13 at intervals
of time varying according to the speed of the ship.
An electrical circuit is accordingly made at similar intervals through the insulated
wire 13 and the electric battery or generator, to the indicating or recording
apparatus in any part of the ship. We arrange a bell or other sounding instrument
in connection with such recording apparatus, so that it is struck or made to sound
every time the electric circuit is completed, and the index hand of the apparatus
advances.
If an electric battery be used in order to provide for a continuous supply of
electricity, we prefer to use two such batteries from which the current is supplied
alternately, so that when one battery is in use, the other can be withdrawn and
replenished or renewed. And in order to prevent the possibility-of-electrical-
contact and consequent-indications being made by such change, we prefer to
arrange a wheel actuated by the apparatus, and having conducting segments in or
attached to it in such manner that the current from one or other of the batteries
is constantly passing through it, and connected with the circuit of the insulated
wire.
When the observations have continued sufficiently long, the cage f may be
drawn up into the case d, the insulated wire 13 coiling itself up, and the valve b is
then closed. The cover e may then be removed if desired, and access obtained to
the apparatus without difficulty or the danger of water entering. Or the apparatus
may be kept continually in work, the indicating apparatus shewing the distance
passed over at any time.
If it is desired that an officer should be called after a certain distance has been
run, we arrange an adjustable needle or index above the dial plate, which indicates
the distance run in such manner that when an index hand actuated by the inter-
mittent electrical currents produced as described comes in contact with the
adjustable needle or index, such contact completes an electrical circuit which rings
a bell or sounding apparatus in any convenient position, and by any of the well
known methods. The adjustable needle being set therefore at a sufficient distance
in advance of the index hand, the contact is only made after the latter has
travelled through a space which is dependent upon the number of times it has been
actuated through the insulated wire, and consequently the distance which the
vessel has travelled.
Apparatus constructed as described may be used for ineasuring and indicating
the speed of streams or currents of water, and consequently the quantity of water
flowing through them in a given time.
Having now described our Invention, and the manner in which it is to be
performed, we do not claim the use of electricity for the purpose of indicating and
recording the speed of ships or vessels passing through the water, but we claim,-
The combination in apparatus for recording the speed of ships, or the velocity
of streams or currents, of the moveable framework having a cylinder containing
revolving vanes at its lower end, the external hollow case and upper cover and
Btuffing box, the adjustable sluice valve, and the screw or equivalent means for

page_text: raising or lowering the moveable framework, substantially as described and shewn
in the Drawings.
Also the combination with the moveable framework, external hollow case and
adjustable sluice valve, and the cylinder containing the revolving vanes, of the
clutch by which the revolving vanes are disengaged when the direction of
movement of the vessel or current is reversed, substantially as described and shewn
in the Drawings.
Also the method by which instantaneous electrical contact is made at intervals
by the fall of a lever from the points of ratchet shaped teeth upon a wheel set in
revolution by the revolving vanes, substantially as described and shewn in the
Drawings.
Also the method of so making instantaneous electrical contact at intervals by
means of metallic springs forced into contact by a lever actuated by ratchet shaped
teeth upon a wheel set in revolution by the revolving vanes, substantially as
described.
Also in combination with the apparatus described and shewn for transmitting
electrical currents at intervals to an indicating and recording apparatus, the
adjustable index, by means of which a bell or other instrument can be made to
sound after any desired distance has been passed over, substantially as hereinbefore
described.
In witness whereof, we, the said Cornelius Edward Kelway and Frank Dyer,
have hereunto set our hands and seals, this 15th day of May, in the year of
our Lord 1889
C. E. KELWAY. (L.S.)
FRANK DYER. (L.S.)