For fast-burning 4.5” barrage rocket. About 3.7” long, steel and brass with Bakelite propeller (loose). 400 made for testing but the rocket for which it was intended was never standardized.
ID number
ST-RK-4
Title
AIR-6 fuze
Abstract
For fast-burning, short-range 4.5” barrage rocket. 4.2” long. Steel and brass, with Bakelite propeller. Since the fast-burning, short-range 4.5” barrage rocket was not standardized, this fuze was not standardized for production. 1,200 were manufactured by Caltech and delvered to Army Ordnance in June, 1944, for tests in a demolition rocket.
ID number
ST-RK-6
Title
PIR-2 (Mk157) fuze
Abstract
For 5.0" aircraft rocket (Model 0) and for 11.75 aircraft rocket (Model 1 and 2). Dimensions same as PIR-1. PIR-2 is a modification of PIR-1 by replacement of instantaneous detonator with delay detonator (0.02 second delay). This one appears to be a Model 0. Development was begun in Feb. 1944. 6,000 Model 0's were manufactured by Caltech in April and May 1944, for tests by the navy. After standardization 96,000 Mk146 Model 1 fuzes of Buord were converted by Caltech to Mk157, Model 0 fuzes. This occurred in the period Oct. 1944-March 1945.
ID number
ST-RK-10
Title
PIR-9 fuze
Abstract
For 11.75” aircraft rocket. 6.84” long. Steel and aluminum alloy. Designed as an improvement to the PIR-2 by upgrading strength, sensitivity, and performance at oblique impact, safety, and ease of loading. Had as a companion PIR-14 for use in 5.0” HVAR. PIR-9 development was halted when it was discovered that the PIR-19 (Mk163) offered sufficient improvement with less radical modification.
ID number
ST-RK-11
Title
PIR-21 (Mk165) fuze
Abstract
This was a modification of PIR-2 with elements of PIR-19. Distinguishing feature is that the fuze head and rocket motor adapter are made in one piece. About 0.33” longer than PIR-2 fuzes, apparent in extension of magazine. During March-June 1945 about 50,000 were manufactured and loaded by Caltech.
ID number
ST-RK-12
Title
PIR-22A fuze
Abstract
There is no information on how this fuze differs from PIR-22. PIR-22 was made for the 5.0” HVAR and was 6.02” long. It was built to be more impact-resistant and more reliable than PIR-20 (Mk164). Preliminary tests were done in September, 1945.
ID number
ST-RK-13
Title
NIR-2 (Mk144) fuze
Abstract
4.175” long. Steel and brass. This fuze was armed by aerodynamic pressure. It turned out that the pressure did not get high enough below the velocity of sound. Work on this fuze was dropped in favor of the AIR-8. Cutaway showing state of fuze after launch.
ID number
ST-RK-14
Title
DDR-2 or DDR-4 fuze
Abstract
DDR (deceleration-discriminating rocket”) Base Fuzes. These fuzes were developed for use in aircraft rockets that have an underwater trajectory. Deceleration is caused by water drag. Detonation occurs at a certain point in the deceleration. These fuzes replaced the AIR-9, -10, and -11. Early model.
ID number
ST-RK-15
Title
HIR (Mk135) fuze
Abstract
Model 2, slightly modified over original and Model 1. 5.511” long. Brass, steel, phosphor-bronze diaphragm. HIR (“hydrostatic-arming, impact-firing rocket”) fuzes were for shipboard rockets (7.2” rocket, Mk1, 2, 4) and for aircraft rockets for retro-bombing (rockets fired rearward from low-flying aircraft) (7.2” rocket, Mk3, 5). They originated at Caltech and were placed in limited production. 25,000 were produced then abandoned in favor of the smaller MK140. Cutaway model.
ID number
ST-RK-16
Title
Mk140 fuze
Abstract
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.
ID number
ST-RK-18
Title
Mk156-158 fuze
Abstract
For several 7.2” shipboard rockets (Mk156) and for 7.2” projector charges (Hedgehogs) (Mk158). 7.345” long. Steel, brass, stainless steel, die-casting alloy. These were underwater vane-arming fuzes. Both mark numbers treated as one fuze, developed from prototypes Mk131 and 136. Cutaway version.
ID number
ST-RK-19
Title
Mk100, Model 0 fuze
Abstract
For GPSR 3.5”/4 and GPSR 5.0”/10. Approx. 4.125” long. Bakelite ogive, brass, steel, other materials. This is an adaptation of the T-28 fuze, the original selective-delay nose fuze, which iteslf was a modification of other fuzes. The Model 0 has a 0.05-second delay. Developed ca 1944-1945. Cutaway version.
ID number
ST-RK-20
Title
Unidentified fuze with propeller
Abstract
About 3.75” long. Brass and steel.
ID number
ST-RK-21
Title
Unidentified fuze, with pencilled note “Buse fuze.”
Abstract
About 3.5” long, steel exterior.
ID number
ST-RK-23
Title
PIR-type fuze, model unidentified
ID number
ST-RK-24
Title
Electroscope, quartz fiber
Abstract
Manufactured by Fred C. Henson Co., Pasadena. Design by C. C. Lauritsen. Physics.
ID number
ST-PH-41
Title
Cloud chamber made by Willy Fowler--2 views
Abstract
25” x 9.5” x 6”. Shop-made. This cloud chamber came from the office of William A. Fowler. It is believed to have been made by him in the 1930s.
ID number
ST-PH-40
Title
Thermometer, Beckman
Abstract
Why this is called a Beckman thermometer is not known. As far as we know it has nothing to do with Arnold O. Beckman. Scale is 0-5c degrees in 1/100s of a degree centigrade. There is an overrange indication to 100 degrees C. Mfg: Brooklyn Thermometer Co. located in either Middletown, NY or Cambridge, MA.
ID number
ST-PH-39
Title
Galvanometer, universal tangent
Abstract
Used at CIT in the freshman physics lab. to demonstrate the presence of electromagnetic fields. The instrument was invented in the 1830s. From Bridge Lab. of Physics. Mfg: Queen and Co., Philadelphia, PA.
ID number
ST-PH-38
Title
Apparatus for demonstrating Lissajous' curves
Abstract
This apparatus produces visual representations of vibrations, called Lissajous' curves, after French physicist Jules Lissajous (1822-1880). Used in CIT freshman physics lab. Mfg: Max Kohl, Chemnitz.
