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Torque testing a tap

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circa 1950
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This picture demonstrates the torque forces required for the use of GTD taps as each cuts a screw thread. The test station is using a Baldwin SR - 4 Type T torque pickup, and is recording the forces required to cut the resulting thread on a chart recorder.
A similar demonstration of this shown at minute 24 of the 1952 GTD film "Facts About Taps & Tapping" (viewable on<strong> <a href="https://youtu.be/33wfSMsUbuc">Youtube</a></strong>) -  
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