It has been shown that the pressure coefficient of a coil of wire depends on the size and construction of the coil as well as upon the composition of the wire. The linearity of the pressurehyphen;resistance relation also depends on the size and type of coil. The effect of winding, of heat treating, and of pressure seasoning on the resistance and pressure coefficient of various coils has been determined and measurements have been made on the effect of temperature on the pressure coefficient of manganin. Convenient equations applicable to the ``fixed bridge'' method for measuring small resistance changes are presented.
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