INVESTIGATION OF A BIMETALLIC WIRE AS A MILLISECOND DELAY ELEMENT
NAVAL ORDNANCE LAB WHITE OAK MD
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A fuse wire composed of palladium and aluminum pyrofuze was investigated as a possible millisecond delay item. The single strand wire and the eight strand braid were both initiated by a constant current device. Delay times of less than 30 milliseconds were obtained from single strand bridged pyrofuze wire, while delay times above 50 milliseconds were obtained from eight strand pyrofuze braid of one- and two-inch lengths. Variations of the delay times were less than 10 when the initiating currents were maintained at 2 amperes above the threshold currents. The delay times were dependent upon the input power, particularly for the very short delay times.
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