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Frahm frequency meter in the Greenslade Collection. This instrument was imported into the United States by James G. Biddle of Philadelphia.
Frahm top in Greenslade Collection. This came from William Jewell College and was once used by the well-known demonstrator of physical phenomena, Wallace Hilton.
Modern Frahm top designed and built by John A. Daffron.
The mechanism in Fig. 3 in action, showing resonance.
A Frahm mechanical resonance apparatus driven by a variable-speed electric drill, designed and built by John A. Daffron.
The mechanism of Fig. 5 adapted as a string-driver, designed and built by John A. Daffron.
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