Engineer's combination rule
- Made:
- 1870
- maker:
- Joshua Routledge
Engineer's combination rule, c. 1870 includes protractor, depth gauge, rule and slide rule function. This combination rule includes a protractor on the jointed hinge and a brass depth gauge sliding section and a sliding logarithmic scale which could be used as a slide rule type calculator.
Details
- Category:
- Industrial Metrology
- Object Number:
- 1984-414
- Measurements:
-
overall: .1575 x 4.9213 x 1.6535 in.; .4 x 12.5 x 4.2 cm
- type:
- combination rule and depth gauge
- credit:
- Wickham, H.W.
