Ruler

Technical Information

Catalogue No: C0799
Category: Personal/Personnel
Object Type: Stationery/Office Items
Object Name: Ruler
Part No: None
Serial No: None
Manufacturer: Elliott Bros
Division: Unknown
Platform(s):
Year of Manufacture: Unknown
Dimensions:
Width (mm):
309 
Height (mm):
Depth (mm):
37 
Weight (g):
55 
Location: Archive Object Store
Inscription(s):

Elliott Bros London
W.H.U.Smith

Notes:

The centre front of this Boxwood Scale Rule.{the side with maker name} of one Scale is marked: 45 & 35, and the other side marked 20 & 40.

This Rule is part of a set of Marquois Scales which usually would have comprised this Rule, another 12 inch rule with scales marked for 25/50 and 30/60 and a triangle.

Marquois scales were devised by a captain of that name c. 1780 for use with his system of surveying for military purposes. Equidistant parallel lines could be drawn with speed and accuracy using his special plain-edged scales together with a right-angled triangle. The triangle easily recognizable since it has two plain and one bevelled edge, its angles ensure its hypotenuse is three times the length of its short side and has two sides marked with an index matrix. Sets of these special Marquois scales continued to be made throughout the nineteenth century.

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