Improvements in Speed Indicators.
Year: 1891

page_text: Date of Application, 10th Apr., 1891
Complete Specification Left, 11th Jan., 1892-Accepted, 27th Feb., 1892
Improvements in Speed Indicators.
We, JOHN CHARLES TAITE and THOMAS WILLIAM CARLTON, of 63, Queen
Victoria Street, in the County of Middlesex, Engineers, and RICHARD MOUNTFORD
DEELEY, Junior, of 10 Charnwood Street, Derby, in the County of Derby,
Draughtsman, do hereby declare the nature of this invention to be as follows:-
This invention has reference to improvements in speed indicators of the kind
described in the Specification of Letters Patent No. 1211 of 1879 granted to
William Stroudley. In such indicators the speed of a locomotive or other engine is
indicated by the height to which a column of water is forced in a gauge glass by a
rotary or centrifugal pump comprising three or more arms or blades mounted on a
spindle and arranged to rotate eccentrically within a circular chamber, the spindle
being driven by the engine whose speed is to be indicated, and the pump chamber
being in communication at or near its centre with a water tank, and at its periphery
with the lower end of the gauge glass.
Now according to this invention in order to increase the sensitiveness and range
of the indicator and thus to enable it to indicate, in a clear and reliable manner,
speeds much lower than those which the former construction is adapted to indicate,
we use in lieu of the arms or blades above referred to, a wheel comprising a number
of radial arms or blades connected to a perforated rim provided with external ribs
or projections.
To enable the accuracy of the indicator to be tested whilst the engine by which
it is driven, is running, and to enable traces of air within the connecting pipes to
be readily removed, thereby rendering the indicator more reliable than heretofore,
there is provided between the gauge glass and the pump, a cock so constructed and
arranged in relation to the pump, and the water tank connected therewith, that in
one position it places the gauge glass in communication with the pump chamber;
in another position it closes this communication and places the gauge glass in direct
communication with the water tank so that the water in the glass will fall to zero
when the scale can be adjusted; in a third position it places the delivery side of
the pump in communication with the water tank so that the water can be caused by
the pump to circulate through the connecting pipes and water tank, thus causing
any air that may be present in these pipes to be removed; and in a fourth position
it enables excess of water to run off.
Dated this 10th der of April 1801
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Speed Indicators.
We, JOHN CHARLES TAITE and THOMAS WILLIAM CARLTON, of 63 Queen
Victoria Street, in the County of Middlesex, Engineers, and RICHARD MOUNTFORD
DEELEY, Junior, of 10 Charnwood Street, Derby, in the County of Derby.
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 to improvements in speed indicators of the kind
described in the Specification of Letters Patent No. 1211 of 1879 granted to

page_text: William Stroudley. In such indicators the speed of a locomotive or other engine
is indicated by the height to which a column of water is forced in a gauge glass by
a rotary or centrifugal pump comprising three or more arms or blades mounted on
a spindle and arranged to rotate eccentrically within a circular chamber, the spindle
being driven by the engine whose speed is to be indicated, and the pump chamber
being in communication at or near its centre with a water tank, and at its periphery
with the lower end of the gauge glass."
Now according to this invention in order to increase the sensitiveness and range
of the indicator when rapid changes of speed are taking place and thus to enable it
to indicate low speeds in a clear and reliable manner, we use in lieu of the arms or
blades above referred to, a wheel comprising a number of radial arms or blades
connected to a perforated rim provided with external ribs or projections. When
radial arms or blades only are used vortices are formed between the blades when
changes of speed are taking place. These vortices as they pass the delivery pipe
orifice modify the pressure, and, therefore, the speed indicated is too low when the
speed is increasing and too high when the speed is decreasing. By interposing
the perforated rim, which is the same width as the chamber in which it revolves,
between these vortices and the delivery pipe, such irregular action is prevented.
Figs. 1 and 2 of the accompanying drawings are elevations at right angles to one
another shewing the construction of wheel used to increase the sensitiveness of the
indicator to changes of speed.
A. A. are the arms supporting the perforated rim of the wheel which is driven by
the engine whose speed is to be measured, B B are projections on the said
periphery of the wheel, and C is the shaft on which the wheel is mounted and
through which it is driven from the engine. A' A' are radial holes formed
through the rim or periphery of the wheel, between the projections B. Each of
these holes may be about one eighth of an inch in diameter. The wheel is secured
to the flange C on the end of the shaft C and is of the same relative diameter of
the pump case, as in the arrangement described in the before mentioned
Specification.
To enable the accuracy of the indicator to be tested whilst the engine by which
it is driven, is running, and to enable traces of air within the connecting pipes to
be readily removed, thereby rendering the indicator more reliable than heretofore,
there is provided between the gauge glass and the pump, a cock so constructed
and arranged in relation to the pump, and the water tank connected therewith,
that in one position it places the gauge glass in communication with the pump
chamber only in another position it closes this communication and places the
gauge glass in direct communication with the water tank so that the water in the
glass will fall to zero whereupon the scale can be adjusted if necessary; in a third
position it places the delivery side of, the pump in communication with the water
tank so that the water can be caused by the pump to circulate through the con-
necting pipes and water tank,,thus causing any air that may be present in these
pipes to be removed; and in a fourth position it enables excess of water to
run off.
Fig. 3 is a vertical central section of the upper part of the apparatus ;
Fig. 4 a horizontal section thereof on the line w w Fig. 3.
Fig. 5 a section on the line ex,
Fig. 6 a section on the line y y and
Fig. 7 a section on the line
of Fig. 3.
Dis the shall or body of the cook by which tha
massages
leading to the water

page_text: the pump chamber, and a passage D leading to exhaust. The plug F is formed
with a longitudinal space or cavity F' and with a passage F extending from the
said cavity radially through the plug.
This cavity F and the passage F2 are so shaped and arranged that when the
handle G is in the position indicated in Fig. 3, the passages D', D², D³ are in
communication with each other through the cavity F', through which consequently
there is communication between the water tank and the gauge glass and between
these and the pump chamber, the passage D' being closed. When the handle is
in this position the water circulates through the pump, pipes, and tank, thus
removing any air bubbles that may have accumulated in the passages or pipes.
When the handle is turned to the left as indicated by the dotted fine G' in
Fig. 5, the passages D' D remain in communication, but the passage D³ is closed.
The water in the gauge E' consequently falls to its zero level; thus the readings
of the adjustable scale H can be verified by observing whether or not the zero of
the said scale coincides with the water level under these circumstances.
When the handle is turned downwards into the position indicated by the dotted
line G, which is the working position, the passages D' and D* are closed, the
passages D D³ remaining open so that the water drawn by the wheel A from the
tank E is forced up the gauge glass E' to a height depending upon the speed of
rotation of the wheel A.
When the handle is turned to the right into the. position indicated by the dotted
line G³, the passage D' is put in communication with the passage D' allowing any
excess of water to pass away from the tank E.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is:
1. In a speed indicator of the kind referred to, wherein a pump is used to force
water into a gauge, constructing such pump with a wheel having projections Bat
its periphery and between these projections perforations or holes such as A' through
the rim of the wheel as described for the purpose specified.
2. In a speed indicator of the kind referred to, the combination with the water
tank, the gauge glass and the pump, of a cock and passages so arranged that in oue
position of the cock plug the gauge glass is placed in communication with the
pump chamber, in another position the plug closes this cominunication and places
the gauge glass in communication with the water tank, in a third position it places
the delivery side of the pump in communication with the gauge glass and through
it with the tank, and in a fourth position it enables water to be run off' substantially
as described.
3. Our improved speed indicator as described with reference to the drawings.
Dated this 11th dov 100
W. Lloyd Wise,
Per F. J. Brougham,
J. C. TAITE.
R. M. DEELEY.
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.