细节
Hartmann & Braun,
an elektro-dynamometer with torsion galvanometer signed on the coil cover plate HARTMANN & BRAUN FRANKFURT A/M No. 53, the glass torsion wire tube with fine adjustment by tangent screw with silvered scale and vernier, the coil cage with two covers, the upper plate engraved 782W=24 to one side, the other 835W=26 , the lacquered brass and oxidised mechanism arranged to rotate on the horizontal plate with tripod stand and three adjustable screws - 24in. (61cm.) high; and an unusual volt meter by Hartmann & Braun, No. 169, the mechanism with universal bubble level arranged for wall mounting with key to side and tension release switch to base, encased by a glazed dome cover, the vulcanite back 8½in. (21.6cm.) diameter (2)
an elektro-dynamometer with torsion galvanometer signed on the coil cover plate HARTMANN & BRAUN FRANKFURT A/M No. 53, the glass torsion wire tube with fine adjustment by tangent screw with silvered scale and vernier, the coil cage with two covers, the upper plate engraved 782W=24 to one side, the other 835W=26 , the lacquered brass and oxidised mechanism arranged to rotate on the horizontal plate with tripod stand and three adjustable screws - 24in. (61cm.) high; and an unusual volt meter by Hartmann & Braun, No. 169, the mechanism with universal bubble level arranged for wall mounting with key to side and tension release switch to base, encased by a glazed dome cover, the vulcanite back 8½in. (21.6cm.) diameter (2)