Signedunsigned
Inscribedengraved on bottom: 2 COILS / WOUND PARALLEL / CENTER H.R. TUBE / 2 IN. DIAM / 6 LAYERS / EACH / 193 A2 TURNS COIL
FunctionFor experimentation and demonstration of the high voltages induced in a secondary winding when the current in the primary windings is abruptly disrupted.
ProvenanceFrom the Department of Physics, Cruft Laboratory, Harvard University.