Unidentified man, aligning wooden supports alongside the tube for the Albert Michelson velocity of light experiment in Irvine, California. the tube behind the man is one mile long, and is 3 feet in diameter. The Albert Michelson speed of light experiment, at the Irvine Ranch, took place between 1931 and 1933. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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