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Description: | KELVIN ELECTROSTATIC VOLTMETER 0-8 kV, 3 ranges, c 1902 (typed on paper label but under cellotape, discarded). Hunterian Museum G.1987.1 (typed on a spirit gummed label, removed). V 51. (old Electrical Engineering Departmental catalogue number stencilled in black paint on the glass fron of the instrument). LORD KELVIN'S PATENTS ELECTROSTATIC VOLTMETER No 417 JAMES WHITE GLASGOW (engraved on makers trade plate inside the instrument case). 23, 84 , 336 (written in ink on the bottom of the seperate compartments containing the riders for the balance). There is a preprinted card with the title "CONSTANT" the headings; Weight 1, Wt 1 + Wt 2, Wt 1 + Wt 2 + Wt 3, and the values added in handwritten ink under the heading Weight in milligrammes 23, 112 , 443 (note these figures don't add up?)., and under the heading volts per scale division 50, 100, 200. The scale is non linear and is stencilled in black on white paint, it reads from 0-40. MANU James White. between 1892 and 1900 16,18, and 20, Cambridge Street, Glasgow, Scotland. DES THOMSON,William,Lord,1st Baron Kelvin of Largs. 1887 This vertical electrostatic voltmeter is a variant of the quadrant electrometer was designed to measure voltages or potential differences in the range 400-10,000 volts . The reading was taken by weighing the electrostatic attraction using the weights (riders) provided. This instrument does not have great accuracy below 400-500 volts. For this reason the multicellular form was designed with much greater sensitivity below 500 volts. The typed label indicates that this instrument was from about 1902 and has a range of 0-8kv. However, the trade plate shows that the instrument was manufactured between 1892 and 1900. The effective range of the instrument was 400V-10kV. On loan to the Physics and Astronomy Department EXIT NUMBER 2092 it is object 4 in display case C Kelvin & 'the New Professors ', in room 470, The Kelvin Building, Department of Physics and Astronomy Glasgow University. | 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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