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Brass & Mahogany High Sensitivity Galvanometer, English, c.1900, signed 'Cambridge Instrument Co Ltd' on cast brass base with leveling screw feet, French polished mahogany and lacquered brass cover, 33cm tall

Large Collection of Laboratory Demonstration Electrical Equipment, including, three demonstration generators, a small induction coil, a Barlow's wheel, a galvanometer mirror holder, and other items, a lot

A Large Demonstration Galvanometer & Other, c.1920, signed to the face 'A Gallenkamp, & Co Ltd, London, in polished mahogany case, with a Lindeman Electrometer by Cambridge Instruments with internal microscope in a mahogany case.

GPO Type Field Telegraph Galvanometer in Case English, c.1900, signed to the silvered dial SEIMENS BROTHERS & Co Ltd, LONDON No.14680, in secondary case with brass handle

A Telegraph Line Test Galvanometer, English, c.1900, signed to the dial 'TELEGRAPH WORKS, SILVERTOWN LONDON' in a leather case with an accumulator below

An Adie brass scale, a Galvanometer etc Condition Report: Available upon request

Collection of vintage electrical items to include; a vintage Voltmeter by Cambridge Instruments Co Ltd England no. 361695, a circular wooden barometer, various wooden cased items; an Ohmmeter by 'Precision Apparatus Company', Watson & Son's electromedical Ltd 'Sunic House' electric shock machine and a Galvanometer. (5)(B.P. 21% + VAT)

Two mirror galvanometers - one marked Sullivan Galvanometer serial no.1483/1950 of green crackled cylindrical form on circular base H24cm; the other by W.G. Pye & Co. Cambridge marked G107-131 on tripod base; together with an ammeter in wooden case (3)Click here to view further images, condition reports, sale times & delivery costs for this lot.

A mahogany cased single-pivot galvanometer, Robert W Fall London, early 20th c, 17 x 17.5cm and several contemporary electrical apparatus, including a Weston Electrical Instrument Co cherry pink stove enamelled DC milliammeter, mounted on walnut with brass terminals, cased The two instruments described in apparently good condition, untested. The others items in the lot, including two Avometer's, showing signs of use and the effects of age / storage

A Late 19th Century Brass & Mahogany Helmholtz Tangent Galvanometer, English, late 19th Century, unsigned but identivle to examples made by Elliot Bros. London, with two parallel coils mounted on two upright circles, the centre with a brass cassed compas needle with silvered scale divided into four quadrants, raised from the base on a turned mahogany pillar, all mounted on a rotating limb with four brass screw contacts, the base with tree levelling feet, 40.5cm tall. Note: Helmholtz refined the tangent galvanometer in 1849 by adding a second outer coil in order to make the magnetic field between the coils, where the galvanometer needle sits, essentially uniform. When at rest, the galvanometer needle and coils are parallel to each other and to the Earth's magnetic field. When current flows, the needle deflects, and the amount of current flowing is exactly proportional to the trigonometric tangent of the angle through which the needle has turned.

A Large Laboratory Tangent Galvanometer, English, c.1900, signed to a brass plaque 'W. Wilson, 1 Belmont St, London N.W', with coil in single mahogany ring with large (17.5cm diameter) compass with two separate scales, on circular base with six brass connectors, on three large levelling screw feet, 39cm tall

VINTAGE ELECTRICAL APPARATUS. A MAHOGANY,  LACQUERED BRASS AND EBONITE EUREKA RESISTANCE BOX, SIEMENS BROTHERS & CO LIMITED LONDON, NO. 3707, EARLY 20TH C, WITH DETACHABLE  LID, 19 X 22CM AND A TEAK CASED GALVANOMETER BY TELEGRAPH WORKS SILVERTOWN LONDON (2) The first item in fine preservation, including the printed paper label of directions of connections for ordinary bridge tests, the instrument quite possibly never used. The second item missing an object from the top of the case and generally grubby / dirty

A LANCET ARCHED MAHOGANY CASED GALVANOMETER, ANOTHER IN LACQUERED BRASS CASE, DIAL MARKED SILVERTOWN, NO 729, 1915, STAMPED GOVERNMENT PROPERTY BROAD ARROW AND A VICTORIAN MAHOGANY CASED GALVANOMETER WITH PAPER DIAL PRINTED GENERAL POST OFFICE ON A BANNER, 18CM H AND SMALLER (3) largest example lacking glass, the others basically complete and condition as the image

A MAHOGANY CASED SINGLE-PIVOT GALVANOMETER, ROBERT W FALL LONDON, EARLY 20TH C, 17 X 17.5CM AND SEVERAL CONTEMPORARY ELECTRICAL APPARATUS, INCLUDING A WESTON ELECTRICAL INSTRUMENT CO CHERRY PINK STOVE ENAMELLED DC MILLIAMMETER, MOUNTED ON WALNUT WITH BRASS TERMINALS, CASED The two instruments described in apparently good condition, untested. The others items in the lot, including two Avometer's, showing signs of use and the effects of age / storage

Vintage Galvanometer & Full Load Earth Continuity tester(2)

Battery eliminator and other items, an Ekco Power Unit, two other battery eliminators, three pairs of headphones, two practice buzzers and a galvanometer in leather case, in 2 cartons (Condition: see note to Lot 398)

A vintage Cambrell Bros & Co Ltd London Galvanometer number 795, with two further examples by Everett Edgcombe London, 251314 and Evans Electroselenium Ltd Halstead Essex, a vintage Comptometer, together with one other model number 993 Bell Punch Co Ltd and a vintage Megger Amp Meter, made in England by Evershed & Vignoles Ltd, a further vintage cased Crystal Mill Volt Meter, type CT88 serial number 1044, made by Epsylom Industries Ltd Felton Middlesex, a Radiac No 2 British Military Meter and an Aluminium case to hold scientific or camera equipment (a collection)

Scientific instrument - Galvanometer by Siemens Brothers & Co of London No 2452, 23 cm high

A Tangent Galvanometer By Griffin, London,English, c.1900, with plaque for 'Griffin London Gramme' and label to underside for 'John Griffin, London', on French polished mahogany base with adjustable feet and brass terminals, brass compass body with glass window, 26cm tall

Tangent Galvanometer By Becker, London,English, c.1910, with plaque for 'F. E. Becker & Co. W & J George, Hatton Wall London', with sliding compass, brass terminals, 50cm long

Cambridge Instrument Co and Other Equipment, comprising a Cambridge Decade Bridge, a Cambridge Unipivot Galvanometer, an H. Tinsley heavy duty potentiometer and a Pye decade box

including a reflecting galvanometer in a mahogany case, and a volt/amp meter on a mahogany base

The galvanometer on large turned French polished wooden base with brass terminals, with lacquered brass cover engraved 'SULIVANS GALVAN No 525 PATENTED, H. W. SULLIVAN, 19 GT Winchester Street, LONDON E. c.' with coil in separate polished pine case all in large wooden travel case, case 37cm high, along with a quadrant electrometer engraved 'Robt W Paul68 High Holborn, with damages.

A FE Becker & Co London, Resistance Measure, Resistance Box, Made by H Tinsley, London, a Pye Scalamp Galvanometer, cased Cowley Level serial number 73733X, Kodak number 3A folding Autographic Brownie Camera, a vintage oak two drawer filing cabinet and card punch, pair of 1920s motoring goggles, three small cigar boxes containing assorted tea cards

An oak cased wheatstone bridge with galvanometer, by Elliott Brothers (London) Ltd, No. 623063, with instructions.

A miscellaneous Lot containing various Railway items to include a GPO Galvanometer. L.N.E.R Tea Cloth. 4 x brass padlocks with keys. GWR Horse Brass. Midland Railway Pen. Office Stamp. LNER playing cards and 3 x Telephone omnibus circuit cards with LMS labels.

Large galvanometer by Philip Harris & Co, and another wooden-cased galvanometer GBO2926 Registered design (2)

MILITARY INTEREST - World War II British Commando style signal/morse torch, and a British Army cased galvanometer by Elliott Brothers

A Phillip Harris and Co brass and ebonised tangent galvanometer, no. 5074, stamped to the silver dial, 17cm wide.

19th Century Raworths Patent telegraph linesman's galvanometer, Dorman & Smith Manchester, housed in a mahogany box, 10cm diameter

A H Baird of Edinburgh Tangent Galvanometer with further cased instrument (2)

G F Palmer of London Induction Coil, with a further cased Galvanometer (2)

A cased galvanometer together with a military issue cased pocket barometer (2)

A pair of brass binoculars, triple adjustable front lens 'Theatre', 'Field' and 'Marine', with adjusting knob, a pair of Dollond & Aitchison binoculars in leather case, a Wheeler, London pressure gauge and a Philip Harris ballistic galvanometer (4).

Scientific instruments - Victorian and early 20th century, Boley & Lieinen clamp; various prisms; volt meter; milliamp meter; capactive probes; galvanometer etc.

A Very Fine Astatic Galvanometer,  C. 1880, signed to the dial in script 'Elliot Bros, London', on polished mahogany base, three adjustable feet glass dome ( with broken piece taped in), in original pine carry case

A large aluminium and Perspex Van de Graaff electrostatic generatorW.B. Nicholson Scotland, mid 20th centuryConstructed with two-part aluminium sphere 12 inches in diameter enclosing fabric covered Perspex pulley over cylindrical plexiglass column above stepped domed base enclosing electric motor driving a conforming pulley, the exterior with FAST/SLOW adjustment knob and tradeplate inscribed VAN DE GRAAFF, GENERATOR around an diamond lozenge enclosing initials WBN, (rubber belt lacking), 98m (38.5ins) high and with insulated short stool; with an 'Earth Inducer' flip coil, the wooden frame with central circular rotating coil incorporating connection posts and detents to lower pivot and disc calibrated for degrees of rotation to the top, the outer frame pivoted at 90 degrees between two panel uprights over base with trade label inscribed SERIAL No. 20148, 400 TURNS 36G D.S.C. COPPER, MEAN DIAMETER 27.7 CM, PHILIP HARRIS LTD. BIRMINGHAM, 54.5cm (21.5ins) wide, (2). Provenance: By repute the Van de Graaff generator featured in an episode of the Dr. Who spin-off television series 'Torchwood'. The Van de Graaff generator was developed bt the American physicist Robert J. Van de Graaff in 1929 as a particle accelerator for physics research; its high potential was designed to be used to accelerate subatomic particles to great speeds in an evacuated tube. It was the most powerful type of accelerator of the 1930s until the cyclotron was developed. Van de Graaff generators are still used as accelerators to generate energetic particles and X-ray beams for nuclear research and nuclear medicine as well as for educational demonstration purposes.The Van de Graaff works on the principal that the simple contact of dissimilar materials causes the transfer of some electrons from one material to the other. In operation the rubber of the belt will become negatively charged while the acrylic glass of the upper roller will become positively charged. The belt carries away negative charge on its inner surface while the upper roller accumulates positive charge within the aluminium globe. The size of the globe dictates the voltage potential that the instrument can accumulate but typically larger examples (as per the current lot) can generate in the region of 250,000 Volts. The Earth Inductor apparatus was devised by Charles Edouard Joseph Delzenne (1776-1866). The instrument is designed to measure the magnitude and direction of the earth's magnetic field using a flip coil in conjunction with a ballistic galvanometer. This is done by quickly flipped the coil through 180 degrees, and reading the output. By measuring the total charge delivered by the induced EMF the magnitude of the magnetic field threading the coil can be ascertained. Condition Report: Generator is intact and complete except for the belt. The aluminium is oxidised and pitted and the dome has some denting. We have not been able to test the electric motor due to non-compliant wiring. The stool has wear from use but is intact, the Earth Inducer is intact and in original condition: we have not been able to test the continuity of the coil. Condition Report Disclaimer

A Victorian torsion galvanometer by Siemen Bros no 5896, the brass and cylindrical glass framework set on a mahogany platform

A G.P.O. BRASS AND MAHOGANY TWIN COIL DIFFERENTIAL GALVANOMETER TYPE 1A, TELEGRAPH WORKS SILVERTOWN LONDON, NO 729, DATED 1915 OF ARCHED FORM WITH SILVERED FACE, PAINTED NEEDLE , DEFLECTION  70-0-70, AND FOUR MILLED TERMINALS, 13.5CM H, STAMPED 50[OHM] TWICE AND GOVERNMENT PROPERTY BROAD ARROW

Philip Harris Ltd. Astatic Galvanometer, black curved scale on brass supports, adjustable pointer under glass cover on circular mahogany base with adjustable brass feet, D24cm, H23cm Condition Report Click here for further images, condition, auction times & delivery costs

Selection of military test equipment in two wooden cases including W.Y.2685 cased test equipment No.60 and Z.D.02704 cased test equipment No.58 MKII, including a Galvanometer Mirror No.1 MKII serial no. 33354/1959 with broad arrow stamp marked Sullivan Galvanometer by H.W.Sullivan Ltd London, and three associated accessory cases and further cased accessories and meter

Early 20th century mahogany cased Galvanometer by Elliot & Swan, No.39792, in original leather case stamped 1918

A silver plated cocktail shaker by W.S & S, together with a box with embossed decoration of revelry in the street, 29cm x 14cm, an ebonised box with silver decoration to the lid, 16cm x 8cm, a cased French galvanometer, a miniature cup with a mark suggesting Helena Wolfsohn and others (6)

Testing equipment in wooden cases including Covermeter Mk.VI, L & N Potentiometer Indicator, Radio City Products Model 314 Tube Tester, G.E.C. Earth Continuity Tester, Dynameg, Galvanometer etc, another bakelite tester in leather case and an electric shock machine (9)

Barograph, ship barometer, two desk lamps, vintage Akai tape recorder, Galvanometer, Trendmaster, case of glass and china, etc.

A World War II period General Electric EU. Aerospace US Navy tachometer MkV, together with a cockpit three in one temperature, oil and fuel gauge, a Pye detector Q & I ATP/ballistic galvanometer dated 1941 and a aircraft control lever (4).

A GALVANOMETER BY GRIFFIN AND GEORGE LTD, and a quantity of other scientific instruments

ELLIOTT BROTHERS BOX SEXTANT a pocket sextant with a anodised metal case and silvered scale, marked Elliott Brothers, London. Also with a vintage Galvanometer by Griffin, London, with a silvered dial and circular wooden base. (2)

World War One British Edison and Swan signals galvanometer, serial number 23882 and dated 1918

TEAK CASED GALVANOMETER

A Mirror Galvanometer & Lamp C.1900, signed 'Sullivan', with the galvanomter on 3 adjustable feet with removeable cover, with mechanical lamp with measuring scale

Cats whisker radio in oak case W25cm and a scientific instrument by Pye, Cambridge, possibly a galvanometer

GENERAL ELECTRIC COMPANY; a dual portable boxed meter up to 300 volts and 5 amperes, and an Elliott laboratory reflecting galvanometer with lamp (2). 

Mahogany glazed cased solenoid operated striking hammers, Interesting scales apparatus marked Stanton London, assorted vintage electrical meters including a Galvanometer, 1 amp F.S.D amp meter, 15mA F.S.D meter, 20mA F.S.D meter and a Negretti & Zambra humidity meter, also three miniature souvenir porcelain time related ornaments of an hour glass, alarm clock and Westminster Abbey

Voltmeters, Ashcroft Paper Tester, compass, Galvanometer and other engineering equipment:- One Box

Philip Harris Ltd. Tangent Galvanometer with silvered dial and scale, black japanned frame on three adjustable brass feet, stamped No.14453, H21cm Condition Report Click here for further images, condition, auction times & delivery costs

Philip Harris Ltd. Astatic Galvanometer, black curved scale on brass supports, adjustable pointer under glass cover on circular mahogany base with adjustable brass feet, D24cm, H23cm Condition Report Click here for further images, condition, auction times & delivery costs

Nivoc Mirror Galvanometer, black crackle finish case on Bakelite base with three adjustable brass feet, Condition Report Click here for further images, condition, auction times & delivery costs

Philip Harris Ltd. Mirror Galvanometer light source with cream paper scale in mahogany surround on black japanned and brass tripod support , W45cm, H24cm, D26cm Condition Report Click here for further images, condition, auction times & delivery costs

Tangent Galvanometer with Griffin & George silvered dial, the circular mahogany frame under dome with brass contacts and adjustable feet labelled for Fred.Jackson, Manchester, D23cm, H23cm Condition Report Click here for further images, condition, auction times & delivery costs