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ID number:  BIRRC-P0192
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Muirhead & Co. Ltd.
Title / Object name:  Ballistic Galvanometer
Object type:  Galvanometer
Place made:  Westminster
Date made:  Early 1900s
Materials:  Heavy brass construction with steel magnets
Measurements:  Diameter 21 cm, height 27 cm

A ballistic galvanometer consists essentially of a coil suspended between the poles of a permanent magnet. When a current flows through it the coil swings and the motion is detected by the deflection of a light beam reflected from a small mirror mounted on it. The present instrument is unusual in having two coils mounted side-by-side (like a pair of spectacles) around two pole pieces of the magnet. There is a set of spare colis (P0265). The whole has a heavy brass case.

Inscriptions / Translations:  MUIRHEAD & Co WESTMINSTER
No 16,275

Notes:  E606. Ballistic Galvanometer
Muirhead No. 16275
2 coils in each box
(from Sir Oliver Lodge).
Brass and black metal
10.5 x 8.25 in.

No. 16275. Brass and black metal, 3 levelling feet. Cylindrical brass case with window. Part of LODGE COLLECTION E606.

Lodge Collection

P0265 is a spare coil assembly for this instrument

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