A biography is given of the outstanding Russian scientist Georgii L'vovich Shnirman, whose scientific life had been 'top secret'. He was an experimental physicist and instrument designer, the founder of many branches of the Soviet instrument-making industry, the originator of a theory of electric methods of integration and differentiation, a theory of astasisation of pendulums, and also of original measurement methods. He was the originator and designer of automatic systems for the control of the measuring apparatus used at nuclear test sites and of automatic seismic station systems employed in monitoring nuclear tests. He also designed the first loop oscilloscopes in the Soviet Union, high-speed photographic and cine cameras (streak cameras, etc.), and many other unique instruments, including some mounted on moving objects.
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