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Scientific American, Vol. 80, No. 8 (1899) (1899)
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considers that, to be of any practical value, | practice, a most delicate sense of touch, and measuring (Continued on page 117.) a naval gun must direct its shot in the comparatively | and testing instru- short distance of, at most, 30 feet so exactly that, after | ments of the great- traveling 2… … The Measuring Machine for Testing Length of the ‘ Points.” Snap Gage and Point. MEASURING AND TESTING INSTRUMENTS USED IN THE MANUFACTURE OF NAVAL ORDNANCE, © 1899 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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