Ball-and-disk integrator
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The ball-and-disk integrator is a key component of many advanced mechanical computers. Through simple mechanical means, it performs continual integration of the value of an input. Typical uses were th
A number of ball-and-disk integrators were used on Lord Kelvin's tidal calculators. The cylindrical output shaft, ball and input disk are clearly visible. The ratio is changed by moving the balls to the left or right along the rack, seen at the top.
PGM-11 Redstone
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The PGM-11 Redstone was the first large American ballistic missile. A short-range ballistic missile, it was in active service with the United States Army in West Germany from June 1958 to June 1964 as
Redstone No. CC-56, Cape Canaveral, Florida, 17 September 1958
US Army field group erecting Redstone missile.
Redstone early production (1953)
Preparations on 16 May 1958 for the first Redstone launch on 17 May conducted by US Army troops. Battery A, 217th Field Artillery Missile Battalion, 40th Artillery Group (Redstone); Cape Canaveral, Florida; Launch Complex 5