An Improved Pressure-gauge.
Year: 1888

page_text: Date of Application, 11th Dec., 1888
Complete Specification Left, 11th Sept., 1889-Accepted, 12th Oct., 1889
PROVISIONAL SPECIFICATION.
An Improved Pressure-gauge.
We, ALPHONSE EDOUARD TAVERNIER, of 17, Colehearne Road, South Kensington,
in the County of Middlesex, Civil Engineer, EDWARD CASPER, of 11, Queen Victoria
Street, in the City of London, Gentleman and GEORGE COLEMAN FRASER, of the firm
of Fraser and Fraser, of Monument Chambers in the City of London, Engineers, do
hereby declare the nature of this invention to be as follows:-
Our invention relates to a pressure-gauge in which the pressure is counterbalanced
by a spring and indicated on a dial or its equivalent, means being provided for testing
and adjusting the power of the spring.
A suitable arrangement of parts for carrying out our invention is as follows:-
A case is provided in which is a flexible diaphragm intended to receive the pressure
of the steam or other fluid. Upon this diaphragm rests a piston connected with a
pivotted arm the free end of which bears upon a spring, the pressure upon the
diaphragm being in this manner communicated to and counterbalanced by the said
spring. The pivotted arm is connected by a link to a toothed sector engaging with
a pinion on the arbor of an index moving over a dial whereby the pressure is indi-
cated. The pivotted end of the arm is provided with a bar extending outside the
case and adapted to receive a weight or weights whereby the accuracy of the spring
in relation to the indicating mechanism can be ascertained.
The spring is advantageously of spiral form arranged upon a curved rod and bears
upon a nut screwed upon the rod, by screwing or unscrewing which nut, the com-
pression of the spring can be adjusted.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
An Improved Pressure-gauge.
We, ALPHONSE EDOUARD TAVERNIER, of 17, Colehearne Road, South Kensington,
in the county of Middlesex, Civil Engineer, EDWARD CASPER, of 11, Queen Victoria
Street, in the city of London, Gentleman, and GEORGE COLEMAN FRASER,. of the
firm of Fraser and Fraser, of Monument Chambers, in the city of London, Engineers,
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:
Our invention relates to a pressure-gauge in which the pressure is counterbalanced
by a spring and indicated on a dial or its equivalent, means being provided for testing
and adjusting the power of the spring.
In the accompanying drawing,
Figure 1 is a front elevation of a pressure-gauge constructed according to my
invention.
Figure 2 is a vertical section, and,
Figure 3 is a horizontal section.
a is a case in which is a flexible diaphragm b intended to receive the pressure of
the steam or other fluid. Upon this diaphragm rests a piston c.working in a cylinder c¹
and connected by a link d'with an arm e pivotted at f; the free end of which arm
is attached to one end of a spring g in such a manner that the pressure upon the
diaphragm is communicated to and counterbalanced by the said spring. The spring
itself is carried upon a guide h pivotted at h¹ to the case of the apparatus, the said

page_text: guide being bent to the form of an arc of a circle of which the pivot h¹ is the centre.
The pivotted arm e is connected by a link k to a toothed sector / pivotted at m and
engaging with a pinion on the arbor o of an index finger p moving over
a dial
9 whereby the compression of the spring and consequently. the pressure is
indicated.
is a rod connected to the free end of the arme and extending outside the case,
the said rod at its free end being adapted to receive a weight or weights
whereby the accuracy of the spring in relation to the indicating mechanism can be
tested..
To enable the pressure of the spring g to be regulated, the end of the same most
remote from the arm e is attached to a screws which is adjustable in a guide t by
means of a nut u.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what 1
claim is
(1) In a pressure-gauge the combination of a piston upon or against which the
pressure acts through the action of an elastic diaphragm, a lever pivotted within the
case of the gauge and to which the said piston is connected and a spring arranged
to act upon the said lever to counterbalance the pressure exerted through the piston,
the movement of the lever being indicated upon a dial through the medium of
suitable mechanism, substantially as described.
(2) In a pressure-gauge of the kind referred to in the preceding claiming clause,
the combination with the arm or lever against which the spring acts, of a lever
extending outside the case and adapted for the attachment of weights whereby the
accuracy of the gauge may be tested, substantially as described.
Dated the 11th day of September 1889.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.