## Abstract

A method has been derived for determining the way the spring material influences the volume of space required for a particular application for a helical spring. It is found that this volume is proportional to the material constants of the spring in the following manner
$VαG7S115$
where G is the torsional modulus of elasticity and S is the limit of maximum stress. Using a multiplier to give this factor a value of 1.00 for music wire, it is found that the value for stainless steel is 1.06, beryllium copper 1.34, and phosphor bronze 2.66, for the springs on the brushes of small motors where springs must operate at temperatures up to 100 C. Different fields of application requiring different limits of maximum stress will change these values but the method still remains the same.
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