Improved Electrical Alarm for use in connection with Steam Gauges.
Year: 1893

page_text: :
Date of Application, 3rd Feb., 1893
Complete Specification Left, 1st Nov., 1893-Accepted, 2nd Dec., 1893
PROVISIONAL SPECIFICATION.
Improved Electrical Alarm for use in connection with
Steam Gauges.
I ARDESHIR TAMULJEE MIRZA of Jamnagar, Kathiawar, India, Mechanical
Engineer, do hereby declare the naturo of this invention to be as follows:-
My said invention relates to a device for use in connection with steam gauges
for giving a continuous alarm when the steam gauge indicates a pressure higher
than the maximum to which it is desired to limit the steam pressure.
At a convenient point in an electric circuit I place an electric bell arranged to
ring when the circuit is closed. One of the wires of the circuit is connected to a
metallic sliding bar mounted on an insulated support on the gauge. By sliding the
said bar backwards or forwards an index is set to any desired graduation of a scale
divided to correspond to that on the dial of the gauge. The other wire of the
electric circuit is placed in electrical communication with a lover pivoted on the
quadrant or other analogous part which moves the index finger of the steam gauge.
The said lever thus partakes of the motion of the quadrant and when the latter bas
moved a certain distance the lower end of the pivoted lever comes in contact with a
prolongation of the sliding bar herein before referred to and the circuit being
completed the alarm bell rings.
By setting the sliding bar the contact may be arranged to take place when the
pressure reaches any predetermined point.
The upper arm of the pivoted lever is provided with a spiral spring which causes
the lower end of the lever to press against the sliding bar and to continue in
contact until the pressure diminishes below the maximum for which the apparatus
is set.
Dated this 2nd day of February 1803.
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improved Electrical Alarm for use in connection with
Steam Gauges.
I ARDESHIR TAMULJBE MINZA of Jamnagar, Kathiawar, India, Mechanical
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 :—
My said invention relates to an electrical device for use in connection with
steam gauges for giving a continuous alarm when the ateam gauge indicates a
pressure higher than the maximum which it is desired to fix as a working or safe
limit..
The accompanying drawing shows my said invention as applied to a Bourdon
steam gauge. It is however also applicable to diaphragm or other gauges in
which the spindle of the index is actuated by a quadrant or other analogous
device.
At a convenient point in an electric circuit I place a bell arranged in the ordinary
manner to ring when the circuit is closed.
One of the wires a of the circuit is connected to the metallio bar & mounted on
the insulated support c. The said bar is provided with slots and set screws and

page_text: an index finger d so that the latter may be set to any desired graduation of the
scale e which is divided to correspond to that on the dial of the gauge.
The other wire of the circuit is connected to the plate g with which the
quadrant is in metallic communication. Pivoted on the quadrant A 1 place a
lever i which thus partakes of the motion of the quadrant and when the latter has
moved a certain pre-determined distance the lower end of the pivoted lever i comes
in contact with the projecting end of the sliding bar b. The circuit is thereby
completed and the bell rings. The place of contact between the lever i and the
bar 6 will be determined by the position of the index d.
The upper arm of the pivoted lever i is provided with a spiral spring k which by
exerting a continual pull on the upper end of the lever i prosses the lower end
against the bar band maintains the contact so long as the pressure of the steam
exceeds the limit for which the apparatus is set.
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 I
claim is :-
:-
In combination with a steam gauge the insulated sliding barb provided with an
index and the contact lever i inserted in an electrical bell circuit substantially as
and for the purpose hereinbefore set forth and shown.
Dated this 31st day of October 1893.
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicant.