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Repulsion type moving magnet milliammeter.

moving magnet galvanometer

Moving magnet galvanometer, made by Kelvin & James White Ltd, Scotland, 1890.

Moving magnet galvanometer

1890

Moving magnet galvanometer made by Siemens Brothers & Co. Ltd, London (England) 1911.

Siemens Brothers & Co. Ltd moving magnet galvanometer

1911

Lineman's detector made by J Sandys for the Electric Telegraph Company, 1855

Lineman's detector, Electric Telegraph Company

1855

Marconi Wireless Telegraph Company lineman's detector, c1920

Lineman's detector, Marconi

circa 1920

Milliammeter no. 735.

Milliammeter no. 735

circa 1900

Moving magnet galvanometer, made by Maker Aeronautical Society, Manchester, 1940.

Manchester Aeronautical Society moving magnet galvanometer

1940

Moving magnet galvanometer, made by Philip Harris Ltd, 1913.

Philip Harris Ltd moving magnet galvanometer

1913

Combined Voltmeter and Ammeter. Brass cased free standing combined ammeter and voltmeter. Range 0-5 amps, 0-6 volts. Range selection by two push levers, used on bench test set.

Combined Voltmeter and Ammeter

Polarised iron ammeter no. 532. Rectangular box on wooden base which has two terminals. Top of the box is clear perspex, showing an ampere scale 0-60 both sides of centre-zero. A permanent magnet has a tubular coil between pole pieces and the moving magnet is pivoted in the middle of the coil, indicating via a pointer attached to the same spindle.

Polarised iron ammeter no. 52

1880

Linesman's detector. Rectangular box with circular dial at the front. Three terminals and brass ring on top. Catch on left side opens back to show two fixed coils wound with blue material. Magnetizing needle drawn into coils when a current is passed through them, indicating strength and direction of the current. Scale is marked 0-90 both sides of centre-zero.

Linesman's detector

Ehrenfeld pocket voltmeter No. 436XX in case, made in Frankfurt (Germany). Also has a box.

Ehrenfeld pocket voltmeter No. 436XX in case

Moving Magnet Galvanometer- Sensitive galvanometer suspension fitted behind hinged coils. The 4 hinged coils have over 16 miles of wire wound on them giving a sensivity of 136,000 of a micro ampere. Manufactured by Nalder Brothers and Company.

Moving Magnet Galvanometer- Sensitive galvanometer suspension fitted behind hinged coils

1930

Moving magnet galvanometer, made by Sharp & Kent, England, 1884.

Sharp & Kent moving magnet galvanometer

1884

Edison and Swan linesman's detector no. 25343. Small rectangular box, housing coil. Circular dial at fron of box with scale and needle pointer. Three terminals on top of meter, two of which are marked I (for intensity) and Q (for quantity). Brass carrying ring.

Edison and Swan linesman's detector no. 25343.

1900