Serial no. 194. Labelled WL-417A. Mfg. Westinghouse.
For first model of Caltech 4.5” barrage rocket; modified army M52 point-detonating fuze. 3.95” long, steel and aluminum. Stamped 2706. 6000 were manufactured between Aug.-Dec., 1942. Replaced in early 1943 by AIR-2 (Mk137).
For 7.2” shipboard rockets (Mk8, 10, 15) and Hedgehog ammunition for Mk10 and 11 projectors. 5.982” long. Steel, plus steel, brass and Zamak die-casting alloy, copper diaphragm seat gasket. Designed to replace Mk135, Model 2, and other fuzes. Development begun July 1942. Difficulties in arming and firing performance halted production; none issued for service use.