Interferometer

Interferometer

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Description
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 example was used with the Mendenhall gravity apparatus at the U.S. Coast & Geodetic Survey.
Ref: Clarence H. Swick, “The Force of Gravity and Methods of Measuring It,” Bulletin of the American Geographical Society 44 (1912): 183-189.
Clarence H. Swick, Modern Methods for Measuring the Intensity of Gravity (Washington, D.C., 1921), fig. 16.
W. H. Burger, “The Measurement of the Flexure of Pendulum Supports with the Interferometer,” Appendix 6 in Report of the Superintendent of the Coast & Geodetic Survey Showing the Progress of the Work from July 1, 1909 to June 30, 1910.
Location
Currently not on view
Object Name
interferometer
Measurements
overall: 6 in x 10 3/4 in x 5 3/4 in; 15.24 cm x 27.305 cm x 14.605 cm
ID Number
PH.315809
catalog number
315809
accession number
221202
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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