Case for improved Perry calculating slide rule
Case for improved Perry calculating slide rule, 10 inch
- Object Number:
- 1911-186 Pt1
- type:
- instrument case
- Image ©
- The Board of Trustees of the Science Museum
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
Case for improved Perry calculating slide rule, 10 inch
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