A rheostat in its original box manufactured by Federal Telephone & Telegraph Co., U.S.A. Accompanying the rheostat is a drilling template and instruction sheet.
This type of rheostat was used to adjust the filament voltage of valves in radios in the 1920s, also used for volume control.
A black plastic knob with metal pointer mounted on a circular plastic bracket. The box is square shaped and made from plain cardboard with two labels stuck on two sides of the lid and a black stamp print on the base. Inside are two sheets of paper with instructions and drawing for a drilling template for mounting the rheostat.
Rheostat: " FEDERAL No. 26 " Box labels: "Federal / Standard / No. 26 / RHEOSTAT / MANUFACTURED AND GUARANTEED BY / FEDERAL TELEPHONE / & TELEGRAPH CO. / BUFFALO. N.Y., U.S.A. ", "GUARANTEE / We hereby guarantee Federal / Standard Radio Products to be / free from all mechanical and elect- / rical defects, and to function / properly when installed in accord-ance with our authorized direct- / ions, and agree to replace, at our / expense, any unit or part [illegible] / may prove defective. / Federal Telephone and Telegrap[illegible] / Form 297 BUFFALO, NEW YORK "
Type of item
64 mm (Width), 61 mm (Depth), 67 mm (Height)
Overall dimensions of packaging box only.