as 60 deg. Now, if thetool had been ground by its edge,tested with a protractor so as tobe exactly 60 deg., the form ofthe thread as seen in an axialsection would be just over 60 deg. In most cases thechange in the angle due to projection would not beenough to be of any consequence; but where such… … First Trial of the - Pax on May 4, 1902.
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