Details
Hartmann & Braun,
A Professor Braun's-pattern "Dead-Beat" reflecting galvanometer, the mirror suspension with viewing apperture, the two coils mounted on limbs and adjusted by rack and pinion over the two horizontal scales engraved to read 0-21, the bell magnet in copper damper, mounted with cross-pins and arranged to rotate over the circular mahogany base with universal bubble level and signed HARTMANN & BRAUN, FRANKFURT A/M, NO. 41, on three adjustable screw feet - 21¾in. (55.2cm.) high; and a mahogany framed Electro Dynamometer with makers plate signed Siemens & Halske, Berlin, No. 2402, with lacquered brass fittings, the dial with needle pointer and original leatherette covered card protective cover - 13¾in. (35cm.) high (2)
A Professor Braun's-pattern "Dead-Beat" reflecting galvanometer, the mirror suspension with viewing apperture, the two coils mounted on limbs and adjusted by rack and pinion over the two horizontal scales engraved to read 0-21, the bell magnet in copper damper, mounted with cross-pins and arranged to rotate over the circular mahogany base with universal bubble level and signed HARTMANN & BRAUN, FRANKFURT A/M, NO. 41, on three adjustable screw feet - 21¾in. (55.2cm.) high; and a mahogany framed Electro Dynamometer with makers plate signed Siemens & Halske, Berlin, No. 2402, with lacquered brass fittings, the dial with needle pointer and original leatherette covered card protective cover - 13¾in. (35cm.) high (2)