Interferometer
notes: label: Description
content: Ralph B. Kennard (1892-1978) was a physicist who, in 1931, built a Mach-Zehnder interferometer—apparently the first instrument of this sort in the United States—and used it to study temperature distribution in air near heated surfaces. In 1943, while working at the National Bureau of Standards, Kennard built a second instrument of this sort, for Princeton University. When that interferometer was retired, Kennard acquired and restored it.
label: Description
content: Ref: “R. B. Kennard, Professor of Physics at American U.,” <i>Washington Post</i> (Nov. 15, 1989), p. C8.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Physical Sciences
creditLine: label: Credit Line
content: Dr. Ralph B. Kennard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.336365
label: catalog number
content: 336365
label: accession number
content: 1978.0207
objectType: label: Object Name
content: Interferometer
physicalDescription: label: Measurements
content: overall; lens attachment: 8 13/16 in x 6 1/2 in x 5 3/8 in; 22.38375 cm x 16.51 cm x 13.6525 cm
label: Measurements
content: overall; interferometer: 7 in x 25 in x 8 1/4 in; 17.78 cm x 63.5 cm x 20.955 cm