. The Bell System technical journal . ct is thetime available for the weld to freeze before a tension strain is placed onit. This time has been measured in the laboratory by the use of a trans-ducer. Weak welds resulted when the time was less than 1 millisecond. ELECTRICAL FUNCTIONS Fundamentally, each weld circuit includes a capacitor which ischarged during a small portion of each cycle and subsequently dischargedthrough a resistance in series with the weld. During the charging period,which is controlled by a cam and microswitch, the contact and thewire end of the comb are separated electrica
. The Bell System technical journal . ct is thetime available for the weld to freeze before a tension strain is placed onit. This time has been measured in the laboratory by the use of a trans-ducer. Weak welds resulted when the time was less than 1 millisecond. ELECTRICAL FUNCTIONS Fundamentally, each weld circuit includes a capacitor which ischarged during a small portion of each cycle and subsequently dischargedthrough a resistance in series with the weld. During the charging period,which is controlled by a cam and microswitch, the contact and thewire end of the comb are separated electrically at the weld point. A mul- CONTACT WELDING IN WIRE SPRING RELAYS 919 tiple leaf brush under considerable pressure connects the one side of thecircuit to the terminal end of the individual wire beiiifi; welded. Tiie ^un,and through it the contact block, is connected to the other side of thecircuit. After a cam frees the gun, the spring propells it toward the wireend and an electrical arc is established by the high potential (900 to. SILICON-COPPERWIRE »*»-ili^*!8SaC
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