Dynamic gauging and automatic adjusting of wire spring relays

RELAYS are the most commonly used electrically operated device in telephone switching systems. A few years ago a radically different design of relay, identified as the "wire spring type," was introduced for use as a basic component of Bell System equipment. Several articles1,2 have been published that describe the design objectives, features, and operating characteristics associated with this relay. A summary of the manufacturing facilities required for the production of millions of these relays annually has been presented.3