Improved Thermometer with Compound Plates.
Year: 1892

page_text: Date of Application, 4th Feb., 1892-Accepted, 9th Apr., 1892
COMPLETE SPECIFICATION.
Improved Thermometer with Compound Plates.
I, GEORG HENRY SIEGMUND OSCAR MÖLLER of 73 Valentinskamp Hamburg
in the German Empire, Mechanician do hereby declare the nature of this invention
and the manner in which the same is to be performed, to be particularly described
and ascertained in and by the following statement:―
This present invention relates to improvements in the well known thermometers
with compound plates in which the movement of a pointer caused by the alteration
in form of the compound plates composed of layers of various metals, indicates the
degrees of temperature. The plate which carries the indicator or pointer spindle
and its parts forms one of the compound plates and is provided with a readily
adjusted device by means of which the movement of the pointer can be regulated.
A second device for regulating the movement of the pointer is attached to the
lower compound plate which at the same time holds the same in position.
Fig. 1 is an elevation of my improved thermometer partly in section with the
case also in section.
Fig. 2 is a vertical section of Fig. I and
Fig. 3 a detail view of the device for regulating the movement of the pointer.
The plate d is attached to the back of the thermometer case a by means of the
screws and distance rings c and serves as carrier for the compound plates e, f ;
the metals of which the same are composed being arranged antipodal to each other,
whereby the screw bolt 9, shell or ring and intermediate ring i serve to hold the
compound plates in position.
An adjusting screw d' is arranged in the carrier plate d & runs through the
case a, so that by means of the same the compound plate e can be somewhat
inclined, whereas the leaf spring k arranged between the plate e and the
elongated ring or shell has the tendency to press the plate e firmly against the
screw d¹.
The compound plate f carries the pointer spindle with spring m and also
the cross spindle o arranged between arms n, to which said spindle the lever P 18
attached, which is connected by chain q to the pointer spindle. The spindle o is
provided with a rod which can be moved forwards rectangularly to the spindle o
the end of the articulated arm or limbs being connected to the compound plate e
gearing with the ends of the said spindle.
The spindle is fixed by means of a clamping screw o' after releasing which the
spindle can be raised or lowered by means of the disc u in opposition to or
corresponding with the direction of the pressure of the spring t.
As soon as an alteration in temperature occurs the compound plates e, f become
curved in consequence of the combination of the metals and thereby produce a
movement of the pointer by means of the limbs, spindle o, lever p and chain q by
means of the pressure of the spring m.
By means of the arrangement of the adjustable spindle r, the leaf spring k which
presses against the compound plate e, and the adjusting screw d' I attain an
extraordinary sensitive and securely acting regulation for the movement in com-
parison with other systems.
The thermometer can at the same time be employed as contact thermometer
when a pin is arranged in the dial or in other suitable position against which the
pointer will strike as soon as a certain temperature is reached and thereby an
electric current become closed and a signal bell rung.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and the manner in which the same is to be performed, I declare that what I
claim is :-
1) In thermometers with compound plates and in which one of the compound
plates serves as carrier for the pointer spindle, the arrangement of a device for
regulating the movement of the pointer consisting of a rod r which is under the
action of a spring and can be adjusted by a disc u and fixed by a clamping
screw o¹, whereby one of the compound plates e is under the pressure of a leaf
spring in order to secure said regulation substantially as described.
2) The improved thermometer with compound plates and regulating device
substantially as described.
Dated this 4th February 1892.
PHILIP M. JUSTICE,
Associate Agent.