improved Means for Recording the [Number of Revolutions Made by the Engine by Means of the Vacuum in the Condenser.
Year: 1888

page_text: improved Means for Recording the [Number of Revolutions Made
by the Engine by Means of the Vacuum in the Condenser.
We, SAMUEL GERRY, of 15 East Street, South Molton, Devonshire and JAMES
WILLIAM DONOVAN, of 4 Elizabeth Street, Sunderland, Engineers do hereby declare
the nature of this invention to be as follows:-
The object of our invention is an arrangement of mechanism for recording or
registering the number of revolutions made by the Engine by means of the vacuum in
the condenser.
For the purpose of our invention we place on the eduction pipe or condenser of
any condensing engine a combined cock and valve having suitable passages whereby
communication is alternately made to the condenser and to the atmosphere, motion
being given to this valve by suitable rods from some moving part of the engine,
preferably the pump levers in a marine engine.
Communication is made by a pipe from the cock or valve on the condenser or
eduction pipe to a cylinder and piston, the top of cylinder being open to the
atmosphere. Attached to the piston rod is a ratchet which actuates a series of wheels
similar to a clock movement and in connection with a dial, so that the recording
machine or dial may be placed at any distance from the engine room where it may be
required to record the revolutions made.
The action is as follows; the bottom of the cylinder or piston on the recording
machine having been put in communication with the vacuum in condenser the piston
is pushed down by atmospheric action and takes the ratchet with it; on the com-
munication being closed to the condenser the piston is drawn up by means of a
spring, thus completing one revolution which is recorded on the registering dial.
Dated this 27th day of March 1888
H. GARDNER,
166, Fleet Street, London,
Agent for the said S. Gerry and J. W. Donovan.
H. GARDNER,
166, Fleet Street, London,
Agent for the said S. Gerry and J. W. Donovan.

page_text: Improved Means for Recording the Number o
by the Engine by Means of the Vacuum in the Condenser.
We, SAMUEL GERRY of 15 East Street, South Molton, Devonshire and JAMES
WILLIAM DONOVAN, of 4 Elizabeth Street, Sunderland, Engineers, do hereby declare
the nature of this invention and in what manner the saine is to be performed to.
be particularly described and ascertained in and by the following statement :-
The object of our invention is an arrangement of mechanism for recording or
registering the number of revolutions made by an engine by means of the vacuum in
the condenser.
For the purpose of our invention, we place on the eduction pipe or condenser of
any condensing engine, a combined cock and valve having suitable passages, whereby
communication is alternately made to the condenser and to the atmosphere, motion
being given to this valve by suitable rods from some moving part of the engine,
preferably the pump levers in a Marine Engine.
Communication is made by a pipe from the cock or valve on the condenser, or
eduction pipe to a cylinder and piston, the top of cylinder being open to the atmosphere.
Attached to the piston rod is a ratchet, which actuates a series of wheels similar to a
clock movement and in connection with a dial, so that the recording machine or dial
may be placed at any distance from the engine room, where it may be required to
record the revolutions made.
The action is as follows:-The bottom of the cylinder or piston on the recording
machine having been put in communication with the vacuum in condenser, the piston
is pushed down by atmospheric action and takes the ratchet with it; on the com-
munication being closed to the condenser, the piston is drawn up by means of a
spring, thus completing one revolution which is recorded on the registering dial.
Our invention will be understood by reference to the annexed drawings.
Figure is a part sectional front view. Figure 2 a part sectional side elevation.
Figure 3 an elevation of the wheel gear and piston. Figure 4 is a view of the tap
and valve partly in section. Figure 5 a detail view of the valve with the upper
part uncovered.
The union or other joint A connects the tap B to a condenser of say, a Marine
Engine. This tap terminates in an open V shaped portion C coverable by a sliding
valve D which can be operated by the lever E from any moving part of an engine to
cover the port F when a vacuum or suction is formed by the condenser in the
pipe G, the passage H through the valve forming the communication when the port F
is covered.
When the vacuum or suction is formed and the port F covered, the piston 1 i
drawn down in the cylinder J and as said piston descends, it by its rod K draws dow
the lever Land communicates by a paul M a step by step movement of the ratche
wheel N, the arbor of which carries a hand for indicating units on a small dial,
pinion on such arbor, gearing into another wheel, from which other hands P, Q, ca
be actuated for indicating the number of movements of the piston I to any extent.

page_text: When the slide valve D is moved by its rod E to uncover the port F, the vacuum
in the pipe G is broken and the piston I returns under the action of its spring R to
its first position, the movement being limited to one tooth of the wheel N for producing
a consecutive numeration or counting.
We arrange the connection B with a tap plug and lever S for shutting off the
communication when the counting is not required.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The apparatus shown on the annexed drawings, acting as and for the purpose or
purposes hereinbefore described.
.
2. The dial, or indicating mechanism arranged in the manner described when
operated by a piston influenced by vacuum and fitted in connection with an engine, as
set forth.
3. The improved means for recording the number of revolutions made by an engine
by means of the vacuum in the condenser as described and by the appliances shown
on the annexed drawings.
The 27th day of December 1888.
H. GARDNER,
166, Fleet Street, London,
Agent for the said S. Gerry and J. W. Donovan.