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Description: | L.E.S.12a. (old departmental number in aluminium paint).
MANU Unsigned. circa 1910 DES after BENNET,Abraham. 1786 Wirksworth, Derbyshire, England, DES after WILSON,Charles,Thomas,Rees,Professor. 1903 Cambridge. DES after GILBERT,William. 1600 London, England. This instrument is in the original form of Wilson's inclining electroscope and not Kaye's later improved version. Wilson, 1903, Camb. Phil. Soc. Proc.,12, p.125 and G.W.C. Kaye, 1911, Proc. Phys. Soc., 23, p.209. It was designed to measure the ionising potential of a radioactive source. The instrument was read by illuminating the gold leaf through one window and noting the travel of the gold leaf using an observing microscope. The plate was charged with a replenisher capable of charging the plate to about 200 volts, probably in the form of a quadrant electrometer. The potential to be measured was from a source in an ionisation chamber or a an ionised body. The sensitivity of the instrument was dependent on its inclination. For example when the plate was charged to about 200 volts, the instrument inclined at 30 degrees, the gold leaf at a potential of 1 volt there was a travel of the gold leaf towards the plate of approximately 5.mm. Kaye's improvement was to add a micrometer adjustment to the travel of the plate so that the distance between the plate and the gold leaf could be adjusted accurately. This was another means of altering the sensitivity 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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