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Vernier depth gauge

Depth gauges by Brown and Sharpe

Combined Vernier callipers and depth gauge

1842-1846

Thickness gauge by Weifs

Not known

Gap pattern thickness gauge

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.

Engineer's combination rule

1870

Vernier callipers, 7", steel, cased, by the Brown and Sharpe Mfg Co, Providence, Rhode Island, USA, with depth gauge 6", by Chesterman, Sheffield, England, both c.1910

Vernier callipers

1905-1915

Mill rope/banding gauge, made by J. Rabone & Sons for Bolton-based company, John Taylor & Sons.

Mill rope/banding gauge

Shopper Thickness gauge, large amplification and dial display

Shopper Thickness gauge

Depth gauge, for setting locomotive piston valves, cased, by Lentz Patents Ltd., London, 1920-1940

Depth gauge

1920-1940