Signedmetal tag on base: THE LEEDS & NORHTRUP CO. / SCIENTIFIC INSTRUMENTS / PHILADELPHIA
around light socket: BRYANT
Inscribedmetal tag on side: PATENTED FEB. 5TH 1907.
serial no. on metal tag: 20053
written in pencil on base: Tuning fork
around light socket: BRYANT 660W. 250V
FunctionFor "producing a rotary motion of constant angular velocity and an alternating current of constant frequency." From L & N Catalogue No. 10, 1927.
Historical AttributesFor information on this instrument, see Leeds & Northrup Company's Catalog 10: Apparatus for Capacitance, Inductance, and Magnetic Measurements (1927).
See also the CHSI file marked "Fork, Synchronizing, L & N."
Cost for synchronizing fork in 1927: $200.
Primary SourcesLeeds & Northrup Company, Apparatus for Capacitance, Inductance, and Magnetic Measurements: Catalog 10 (Philadelphia: 1927).
Leeds & Northrup Company, The Leeds & Northrup Synchronyzing Fork, Bulletin No. 980A (Philadelphia, PA: Leeds & Northrup Co., n.d.), p. 3.
ProvenanceFrom the Department of Physics, Jefferson Laboratory, Harvard University.