A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE, MECB ANICS, CHEMISTRY, AND MANUFACTURES. Vol. XXI.—No. 7. j S$3 per Annum. NEW YORK, AUGUST 14, 1869. [NEW SERIES.] ! ? [IN ADVANCE. Shaw's Gunpowder Hammer for Driving Piles, ing composed of one and a half parts chlorate of potash, and…
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