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Description: | Maker's armorial bearing the legend Sir Wm Thomson's Patent No. (no number added). J. White Glasgow DES THOMSON,William,Lord,1st Baron Kelvin of Largs. after 1876 MANU J. White. [241 or 209 Sauchiehall Street or 16, 18 and 20, Cambridge Street], Glasgow, Scotland This ten inch card appears to be a pre-production model of one of two forms of the dry card. The two types are, form a, which has the needle assembly suspended below the plane of the card and form b, which has the needle assembly above the plane of the card. In this type which is form a, the platinum-irridium needle is supported above the nave of the card pointing downwards through the plane of the card and would have been supported on a sapphire bearing. The two groups of four fine steel needle magnets suspended on green silk threads below the plane of the card are arranged in parallel rows on either side of the nave. The paper bezel is supported by a thin aluminium ring and 32 radial green silk threads attached to the nave which consists of a fine, pierced aluminium disc. The wooden box associated with this card is stored in SCI. 26.12 | 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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