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Scientific American, Vol. 80, No. 8 (1899) (1899)
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ct 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 miles, it will strike within a circle 20 feet in| est obtainable ac- diameter, some idea may be had of the great accuracy | curacy. with which such… … 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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