A Late 19th Century Brass & Mahogany Helmholtz Tangent Galvanometer

A Late 19th Century Brass & Mahogany Helmholtz Tangent Galvanometer (image 1/6)
A Late 19th Century Brass & Mahogany Helmholtz Tangent Galvanometer (image 2/6)
A Late 19th Century Brass & Mahogany Helmholtz Tangent Galvanometer (image 3/6)
A Late 19th Century Brass & Mahogany Helmholtz Tangent Galvanometer (image 4/6)
A Late 19th Century Brass & Mahogany Helmholtz Tangent Galvanometer (image 5/6)
A Late 19th Century Brass & Mahogany Helmholtz Tangent Galvanometer (image 6/6)
Pricing & History
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. (Qty: 1)
Items in the Price Guide are obtained exclusively from licensors and partners solely for our members’ research needs.
If this item contains incorrect or inappropriate information please contact us here to flag it for review.

If you are the originator/copyright holder of this photo/item and would prefer it be excluded from our community, contact us here for removal.