Accession No
2227
Brief Description
'Douglas' combined protractor and parallel rule, by the London Name Plate Manufacturing Company Ltd., English, c.1920
Origin
England; London
Maker
London Name Plate Manufacturing Company Ltd.
Class
drawing
Earliest Date
1920
Latest Date
1920
Inscription Date
Material
plastic; paper (cardboard and one other)
Dimensions
slip case: 141mm width x 131mm length x 9mm height
Special Collection
Provenance
Transferred from Department of Geography, University of Cambridge, Cambridge, England, 05/1969. Purchased at W.Heffer and Sons Ltd, Sydney Street
Inscription
‘“DOUGLAS” COMBINED PROTRACTOR AND PARALLEL RULE
REGD NO 626265 - SOLE MAKERS THE LONDON NAME PLATE MANFG. CO. LTD.’ (top of instructions)
Description Notes
‘Douglas’ combined protractor and parallel rule. grid printed on transparent plastic square. Divided around perimeter into degrees marked 0 - 360 and 360 - 0. Cardboard slip case with printed instructions.
2 parts plus Geography dept label and fastener (24/03/2021)
References
Events
Description
Parallel rule
Used by architects, engineers, cartographers and on nautical charts, the parallel rule is used for drawing parallel lines accurately. It is also used in conjunction with a scale rule for producing orthogonal drawings (with lines in non-parallel direction as well). The pivoting links can be extended to the required distance, but this makes the instrument liable to error for larger drawings because the extension is changed by hand, and can be varied accidentally.
18/10/2002
Created by: Saffron Clackson on 18/10/2002
FM:45399
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