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Description: | KE.12.S.(Green and Lloyd catalogue number). Makers name, punched, "LORD KELVIN'S PATENTS, QUADRANT ELECTROMETER No. 203, KELVIN & JAMES WHITE LTD GLASGOW". Gummed Label with the legend "Donated to the University of Glasgow by Kelvin Hughes a Division of Smith's Industries". MANU Kelvin & James White Ltd Glasgow. After 1900 16, 18 and 20, Cambridge Street, Glasgow, Scotland. DES THOMSON,William,Lord,1st Baron Kelvin of Largs. 1867 This instrument is in the form of a torsional balance which can be read directly from a mirror fixed to the suspension in the same way as a mirror galvanometer. There is a vernier adjustment on the supporting wire which enables the instrument to be calibrated to zero. This type of instrument was calibrated against an absolute electrometer and then used as a laboratory standard. Typically in the range 0-400 volts. They required to be operated with a dry atmosphere inside the leyden jar and to this end concentrated sulphuric acid was added. electrical contact between the vane and the leyden jar was maintained by a platinum trailing wire. Although there is superficial damage this example does not have the usual surface oxidation caused by acid fumes. The charge on the moveable plate can be measured against an earth by the use of the idiostatic electrometer built into the top of the instrument. | 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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