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Description: | KIB.4. (Green and Lloyd catalogue number in white paint). 0-5-10-15 (linear scale in units pencilled on a hand made paper scale). MANU [J. White] [between 1884 and 1895] [16,18, and 20, Cambridge St, Glasgow] [Scotland] DES THOMSON,William,Lord,1st Baron Kelvin of Largs. after 1884 This instrument is an attracted iron ampere meter and it is of the initial type of balance produced between 1884 and 1895. The use of a hand drawn paper scale and the absence of a makers trade plate or serial number would suggest that this instrument may be a prototype or preproduction model. This instrument is based on Faraday's observation that a mass of iron in a non-uniform magnetic field tends to move from areas of relatively weaker magnetic attraction to areas of stronger magnetic attraction. These instruments were designed for engine room switchboards controlling lighting and power sytems. The instrument is a horizontal balance and was probably comprised of a soft iron cylinder, situated in the centre of a conical coil and attached to an aluminium needle at either side of a pivot. The coil is heavily shielded by a cast iron casing. There is a piece of copper foil wrapped around the pointer probably to counteract the weight of the soft iron mass. | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
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