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Description: | TOP (crudely scribed twice on the top hub of the drum. DES THOMSON,William,Lord,1st Baron Kelvin of Largs. circa 1880 Glasgow, Scotland. MANU J. White. 1891 16, 18 and 20, Cambridge Street, Glasgow, Scotland. This chart drum associated with tide gauge No 5 which was, the second of three instruments made for the Clyde Docks. The gauge consists of a fourteen day (fide Green and Lloyd, 1970, Kelvin's Instruments and the Kelvin Museum, p. 45.) pendulum clock mechanism. It drove a chart drum on which was drawn a pencil record of the height of water in the dock. This was achieved by means of a copper float in a protective tube connected to a stylus or pencil via a pair of wheels connected to a gear train of two pinions which scaled down the vertical float movement from I ft to 1 cm over a tidal range of about twenty one feet. The instrument was completed in 1882 and was presumably used at "Kelvinhaugh" until it was converted to a pen recorder in 1891. The counterweight and pen attached are from 1891. GLAHM 113558 was the original counterweight and pencil holder from 1882. The instrument may have then been transfered to the "Partick Wharf Queen's Dock" (It is unclear if this apparent change of location was actual or due to a change of name. It requires further research to clarify this since both the charts and drums are interchangeable it may be that these items are from one of the other two instruments). It was replaced by an improved instrument in 1910 which is consistant with the chart that was on this drum and dated from the 23rd to the 30th May 1910. See GLAHM 113560. | 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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