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
Perry calculating slide rule and case
- 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
Parts
Improved Perry calculating slide rule
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
- Measurements:
-
overall: 10 mm x 277 mm x 42 mm, 0.076 kg
- Materials:
- brass (copper, zinc alloy) , ivory , paper (fibre product) , aluminium , glue and glass
- Object Number:
- 1911-186 Pt2
- type:
- slide rules
- Image ©
- The Board of Trustees of the Science Museum
