Improved Perry calculating slide rule

Made:
1910-1911 in Manchester
manufacturer:
A G Thornton Limited

Improved Perry calculating slide rule, 10 inch; in case, scale of inches and fiftieths on bevel edge, special cursor of aluminium and glass with pointer attached for rapidly calculating engine diagrams, etc., cursor has broken hair line for easy reading, double faced with celluloid log-log scales along the whole length and bottom edges; printed list of constants etc., pasted at back

Details

Category:
Mathematics
Object Number:
1911-186 Pt2
Materials:
aluminium, brass (copper, zinc alloy), glass, glue, ivory and paper (fibre product)
type:
slide rules
credit:
A.G. Thornton Ltd