Accession No
2891
Brief Description
rolling parallel rule, by Stanley, English, 1940 (c)
Origin
England; London
Maker
Stanley
Class
drawing
Earliest Date
1940
Latest Date
1940
Inscription Date
Material
metal (electrum); wood; paper
Dimensions
box length 530mm; breadth 108mm; height 58mm
Special Collection
Provenance
Donated.
Inscription
‘Stanley, Great Turnstile Holborn London’
MADE BY
W.F. STANLEY
Optical Philosophical & Mathematical
INSTRUMENT MANUFACTURER
ENGINE DIVIDER etc
MATHEMATICAL DEPARTMENT, GREAT TURNSTILE, HOLBORN, W.C.
OPTICAL & PHILOSOPHICAL DEPOT, RAILWAY APPROACH, LONDON BRIDGE.’ (label in box)
Description Notes
Solid electrum rolling parallel rule; divided 0 - 90 - 0 by 10 to 1 along 3 edges. Knurled rollers at either end of moulded ridge; knurled knobs.
Fitted wooden box.
Condition
References
Events
Description
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:44443
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