Signedon each fork: VALANTINE & CARR
Inscribedtop of case, stamped: 516-540
FunctionWas used for precise measurements of beats. It was invented by Johann H. Scheibler and it usually came with resonators to amplify the forks' pitches and beats. The resonators were not necessary though.
Related WorksJohann H. Scheibler, Der physikalische und musikalische Tonmesser (Essen: Baedeker, 1834).