Hunterian Museum & Art Gallery Collections:
GLAHM 105596


This information is © The Hunterian Museum and Art Gallery, University of Glasgow 2017

Compass deflector

DES THOMSON,William,Lord,1st Baron Kelvin of Largs. 1876 MANU Kelvin & James White Ltd Glasgow. between 1900 and 1904 16, 18 and 20, Cambridge Street, Glasgow, Scotland


Materials:
brass,steel,mahogany,silver,
Dimensions:
OA 186mm x 83mm x 115mm
Marks:
Hunterian Museum G. 1987.43 (typed on a gummed label, removed). LORD KELVIN'S PATENTS No 706 KELVIN & JAMES WHITE LTD GLASGOW (makers trade name engraved on body of instrument). O-40 in unit divisions (on a linear silver scale). There are some pencil marks inside the lid of the mahogany carrying case which read N Stoddart 7 0 6 ( ? name of owner and serial number)
References:
FIG KEPPIE,Lawrence,Dr and SWINBANK,Peter,Prof. 1989 P.29
Notes:
NFA assisted purchase. The instrument consists of a pair of permanent steel magnets mounted on a brass cantelever, as opposed to the more complex pantelever of GLAHM 105595. The action of which is controlled by a turned shaft which has a circular vernier such that one complete revolution of the shaft moves the base of the pantolever one scale unit.. Presumably the instrument fitted into a Kelvin binnacle next to the compass card at the same level as the card and at a fixed distance from the card indicated by the probe. There one locating lug and a slide guide on the base of the instrument. The magnetic field produced by the magnets can be used for fine compensation for magnet fields in ships. The instrument was manufactured some time between 1900 and 1903.
Keywords:
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For more information please contact Malcolm.Chapman@glasgow.ac.uk