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.
- Industrial Metrology
- Object Number:
overall: .1575 x 4.9213 x 1.6535 in.; .4 x 12.5 x 4.2 cm
- depth gauge
- furnishing and equipment
- measuring device - instrument
- Wickham, H.W.
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