Accession No
3364
Brief Description
parallel rule, mid-19th C
Origin
Maker
Class
drawing
Earliest Date
1825
Latest Date
1875
Inscription Date
Material
wood (ebony and one other); metal (brass); cloth (hessian)
Dimensions
box length 405mm; breadth 81mm; thickness 23mm
Special Collection
Provenance
Purchased from D. Stanley auctions, lot 376, 20/01/1986.
Inscription
Description Notes
Ebony parallel rule with 3 members,joined on brass shaped pivoting bars. 1 brass screw at centre of each outer member. Crude wooden box lined with green hessian. Several signatures of former owners inside box - John Piekance, Henry Crocket, Mr Richard Argyle Fenner (?).
Condition good; complete
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:44438
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