from The Century Dictionary.
- noun A device for testing the diameter, the pitch, and the accuracy of the thread of screws.
Sorry, no etymologies found.
The size of screws is indicated by their length in inches, and by the diameter of the wire from which they are made, using the standard screw-gage, Fig. 220, p. 117.
_Machine-screws_, Fig. 231, are similar to stove-bolts, but are accurately cut and are measured with a screw-gage.