Accession No
2741
Brief Description
Indian pattern clinometer, Mark VI, by P.T.I.C. Ltd., 1915 (c)
Origin
Maker
P.T.I.C. Ltd.
Class
surveying
Earliest Date
1915
Latest Date
1915
Inscription Date
Material
metal (brass, steel); hide (leather)
Dimensions
case length 267mm; breadth 68mm; depth 67mm
Special Collection
Provenance
Purchased from Christie’s, South Kensington, London, England; lot 86, 12/03/1981.
Inscription
‘PTIC Ltd
MARK VI
191?’ (on bubble)
‘F. LTD
MK.VI’ (on case)
Description Notes
Indian pattern clinometer, by P.T.I.C. Ltd., c. 1915.
Brass and steel. Folding pinhole and window sights; window sight graduated (23) - 0 - 20˚ by 5 to 20’ and (.42) - 0 - .36 by .02. Index wire adjusted by rack and pinion with knurled screw: bubble in horizontal beam, hinged to base and adjusted by brass knurled screw.
Fitted leather case.
References
Events
Description
A clinometer is an instrument for measuring vertical angles or slopes. This Indian Pattern clinometer is used with a prismatic compass for rapid surveys. The sides of the flat vane are graduated in degrees above and below the horizontal. The observer sights through the pinhole, moving the adjustable viewer on the vane to line up with the desired feature, then reading off its elevation or depression. The reverse of the vane carries a scale of tangents.
10/03/2009
Created by: Dr. Anita McConnell on 10/03/2009
FM:44513
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