Telephone Apparatus Springs: A Review of the Principal Types and the Properties Desired of These Springs

A Review of the Principal Types and the Properties Desired of These Springs This article describes the types of springs employed in telephone a p p a r a t u s a n d enumerates the engineering requirements both from the standpoint of mechanics a n d the q u a l i t y of materials desired. T h e chemical a n d physical requirements of the spring materials are given. The importance of fatigue is emphasized a n d the endurance limit is given for spring brass, nickel silver a n d phosphor bronze.