peration and Commercial Applicati SCIENTIFIC AMERICAN SUPPLEMENTS 1306. 1307," 1308, 1422, 1400, 1447, 1370. 1372. The articles have all been prepared by experts in steam engineering. Price 10 cents each, by mail. Munn & Co., 3861 Broadway, New York City, and all newscealers. PERFECT - PUMP -… … ‘With it yon can sketch your ideas to scale correctly, quickly, and with THE OF less tools, yone can work it. Does in TWO operations what the old style tee-square requires TWELVE. It saves time and temper. The device shown, with 20x 27 inch board, two 19-inch white collulnid edged scales (any…
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