Steel scaling rule 1:500 metres and 1:200 metres.

Mathematics

1960-1980

Steel scaling rule 1:500 metres and 1:200 metres.

scale rule

Tools of the Trade & Personal Accessories

Ruler/Scale, wooden with bevelled edges, white scales inset on edges marked "Engine Divided", by W.H. Harling Ltd, 117 Moorgate, London. Initialled on back "GWB 1930". Used in the P-Way Office. 13"x1 1/2"

scale rule

Tools of the Trade & Personal Accessories

Ruler/Scale, Wooden with bevelled edges, marked "Engine Divided" "Hall Harding Ltd" with initials BGH engraved in wood. 12 1/2"x1 1/4"

scale rule, Permanent Way

Tools of the Trade & Personal Accessories

Ruler/Scale, wooden 3-sided ruler showing various different scales used in Permanent-Way Dept made by The Art Metropole Limited Toronto. Overall: 326 mm x 20 mm x 20 mm.