Movement for instruments

Claim 1

A readily calibratable instrument of the bimetal movement type comprising i. a one-piece metal base plate having first, second and third integral portions upstanding therefrom, the first and second portions being rigid and each being normally fixed in position relative to the remainder of said base plate and being nonresiliently displaceable relative to said base plate only upon the application of an appropriate bending force; ii. a somewhat U-shaped unitary structure formed by a. a first plate-like bimetallic arm, b. an electric resistive wire heater encompassing said first arm, c. a second plate-like metallic arm secured to said nonresiliently displaceable first portion, and d. a bridge connecting one end of said first arm to one end of said second arm; iii. a marked scale secured to said third portion; iv. pointer means coupled to said first arm and cooperating with said marked scale; and v. a fulcrum for said pointer means secured to said nonresiliently displaceable second portion, whereby application of an appropriate bending force to at least one of said first and second integral portions achieves a non-resilient positional displacement of at least one of said first and second portions relative to said third integral portion and a consequent nonresilient positional displacement of said pointer means relative to said scale thereby to effect calibration of said instrument.