Photo by David Friend Productions, San Diego, California
OUDIN RESONATOR by E. BALZARINI
10-028. Italian, ca 1900, with brass trade label on top of the coil "E. BALZARINI, MILANO." The apparatus is mounted on its original 19 5/8" x 9 7/8" x 3/4" white marble base with cast brass lion feet. On one end of the base is the 7 3/4" diamter x 21" mahogany coil form wound with 39 turns of heavy gage copper wire (the inductor in this resonant circuit); next to the coil is a 20 3/4" brass rod with a variable height pick-off to vary the resonant frequency of the apparatus; next to the pickoff is a pair of 10" tall Leyden jars connected by copper wires to the spark gap (the capacitors); at the other end of the base is the brass & glass spark gap holder (the excitation source) and a mahogany framed colored glass filter to observe the spark through. This exceptional Oudin resonator is in fine overall condition. See page 1035 in Max Kohl's 1909 "Price List No. 50" for an illustration of a very similar (but much less elaborate) "Apparatus for Generating Currents of High Frequency and Voltage by Resonance."
