6 inches square, either of which may be mounted on a stand. The Resonator consists of a brass tube with close-fitting sliding piston. This tube is of sufficient length to respond to the notes emitted by either the Bell or Plate when set in vibration. Complete as illustrated, with Bell, Plate,… … No. 55-32 BRASS HELMHOLTZ RESONATORS. These Resonators are thin brass globes, with wide orifices at one side to receive the exciting waves and narrow orifices to conduct the vibrations to the ear. They are accurately made, neatly polished and lacquered. Fundamental tone, low C = 64 VPS. 55-30…
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