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Horstmann adjustable thread caliper gauge for M8 threads

Horstmann adjustable thread caliper gauge for M8 threads

ring gauge

ring gauge

1907
ring gauge

ring gauge

1969
Thread gauge by Holtzapffel

Thread gauge by Holtzapffel

Sample thread gauge

Sample thread gauge

circa 1917-1919
Sample thread gauge

Sample thread gauge

circa 1917-1919
Three O-VEE Spring Thread Gauges.

Three O-VEE Spring Thread Gauges.

1946 or later.
Taper Thread Gauge checking machine, 1934, for the measurement of the thread pitch.

Taper Thread Gauge checking machine

circa 1934
Five thread gauges

Five thread gauges

Set of Whitworth/Metric thread gauges, recovered from British Rail Engineering Ltd. Swindon

Metric thread gauge

Steel centre gauge, Whitworth standard 55 degree angles. Pattern no. 878, and steel centre gauge, U.S. standard angle, 60 degrees pattern no. 879, both mounted together on a display board (see 2 stroke nos).

Steel centre gauge