“...represents a Savart bell and resonator. The length of the resonant air-column is changed by means of the moveable bottom of the resonator, which is to be adjusted by trial for resonant effect.” -Avery 1895
Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 250
2400×1564, 737.6 KiB
1024×667, 100.0 KiB
640×417, 50.1 KiB
320×208, 17.1 KiB