- The vibration microscope (or optical comparator) was used to calibrate the frequency of a tuning fork in terms of a fork of known frequency. Hermann von Helmholtz invented the form; Jules Antoine Lissajous introduced that in which the reference fork is driven electromagnetically. This electromagnetic example is inscribed “Rudolph Koenig a Paris” and was used at the U.S. Military Academy at West Point.
- Ref: Rudolph Koenig, Catalogue des Appareils d’Acoustique (Paris, 1865), p. 12.
- Rudolph Koenig, Catalogue des Appareils d’Acoustique (Paris, 1889), p. 83.
- Currently not on view
- Object Name
- optical comparator
- Rudolph Koenig
- place made
- France: Île-de-France, Paris
- overall: 17 1/8 in x 9 1/2 in x 9 1/2 in; 43.4975 cm x 24.13 cm x 24.13 cm
- ID Number
- accession number
- catalog number
- Credit Line
- United States Military Academy
- See more items in
- Medicine and Science: Physical Sciences
- Data Source
- National Museum of American History
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