SignedOn cylinder: WIRELESS SPECIALTY / APPARATUS CO. / DEPOSIT NO. 4 / NEW YORK / PAT JULY 21 1908
FunctionThis set of objects very likely a rudimentary form of LC circuit (inductance-condenser). The glass cylinders with copper plating are very likely condensers. Together with an antenna, the set could be used as a radio signal receiver. Varying the inductance by turning the crank, one can change the tuning frequency.
ProvenanceFrom the Physics Department, Harvard University, 1965. Was stored in the Lyman Laboratory attic.