Hertzian receiving resonator, 1890-1894
1890-1894
Helmholtz Resonator
1880-1900
Helmholtz Resonator
1880-1900
Helmholtz Resonator
1880-1900
Helmholtz Resonator
1880-1900
Helmholtz Resonator
1880-1900
330 metre Piezo-electric resonator in bakelite box
Oudin resonator with two Leyden jars
1897-1910
Resonator of adjustable pitch
1876