Title: SIR (Mk139) fuze
Date: 1942 (approximate)
Original Format: photograph: negative
Description: Model 0: for a variety of 7.2″ rockets. 4.190″ long. Brass alloy, brass rod, steel, die-casting alloy, manganese-bronze, flexible fiber gasket. SIR (“spring-arming, impact-firing rocket”) fuzes were designed for retro-bombing in antisubmarine warfare. Developed in 1942-1943, they were not produced in large numbers because of the abandonment of retro-bombing. “A”: cutaway version; “B”: complete version.
Collection: Scientific Instruments
Caltech Archives ID: ST-RK-17A-B
