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Designed by the American physicist, Albert A. Michelson, this type of interferometer measures the speed of light along two different paths. Using an instrument of this sort in 1887, Michelson and Edward Morley showed that the speed of light is not affected by the motion of the earth through the supposed luminiferous ether. This unmarked example came from the University of Illinois.
Ref: Clarence H. Swick, Modern Methods for Measuring the Intensity of Gravity (Washington, D.C., 1921), fig. 16.
Currently not on view
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overall: 26.6 cm x 37.5 cm x 26.7 cm; 10 15/32 in x 14 3/4 in x 10 1/2 in
overall: 10 3/8 in x 8 1/8 in x 13 1/2 in; 26.3525 cm x 20.6375 cm x 34.29 cm
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Medicine and Science: Physical Sciences
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National Museum of American History
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