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Michelson Mirror Apparatus
mid-1920s

Measuring the speed of light
Albert Michelson used this eight-sided rotating mirror apparatus in experiments at Mount Wilson, CA, to measure the speed of light. Manufactured by the Sperry Gyroscope Company--which also supplied a high-intensity light employed in the experiment--the mirror and turbine are cut from one piece of nickel steel.

Notes
Albert Michelson (1852-1931) was the first American to win a Nobel Prize. He was recognized for his contributions to precise measurement.

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