DROP HANGER. > 1873 SCIENTIFIC AMERICAN, INC October ii, 1873.] ^umMt ^mmm. 237 St^wirtisifm^tttsi. RATES OF ADVERTISING.Back Page ....... Sl.OOaline. Inside Page ...... 75 centsa line. Engravings Tnay head advertisements at the same rate perline, by measurement, as the letter-press. BAIRDS … FIR PRACTICAL MEN. -o- M7 new, revised and enlarged Catalogue of PracticalAND Scientific Books—96 pages, 8vo.—will be sent, freeof postage, to any one who will favor me with hisaddress. HENRY CAREY BAIRD, INDUSTRIAL PUBLISHER,406 WALNUT STREET, Philadelphia. THE Ml Metal Workers Instructor, FOR…
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