■■^rcyrj illfi Mi 73T<^5L>>3- (jJ/'^C>J [Entered at. the Post Office of New York, N". Y., as Second Class Matter. Copyrighted, 189:. by Mnnn & Co.] A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE, MECHANICS, CHEMISTRY, AND MANUFACTURES. NEW YORK, FEBRUARY 28, 1891. I $3.00 A YEAR. Vol.… … system of supply, and without doubt the two most ing special attention to accurate measurement of dis- tances. important events in the history of modern ordnance Fig. 2.-HYDEAULIC GUN CASTING. in the United States, were the researches and recom- Of the 10 inch guns, the four that make up the arm-…
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