Accession No
2576
Brief Description
parallel rule by Stanley, late 19th C
Origin
Great Turnstile; Holborn; London; England
Maker
Stanley
Class
drawing
Earliest Date
1875
Latest Date
1900
Inscription Date
Material
metal (brass, oxidised brass); wood
Dimensions
box length 805mm; breadth 115mm; thickness 55mm
Special Collection
Provenance
Transferred from Institute of Astronomy, University of Cambridge, Cambridge, England, 06/1980.
Inscription
‘STANLEY, GREAT TURNSTILE, HOLBORN, LONDON’
‘AST. LAB 103’ (crossed out on reverse)
‘SPO. 171’ (reverse)
Description Notes
Rolling-type parallel rule. Oxidised brass with brass roller and two knurled knobs. In fitted wooden box.
Condition good; some corrosion on one clasp of box
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:44435
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