T^T<^L>^ZT [Entered at the Post Office of New York. N. Y., as Second Class Matter.] A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE. MECHANICS, CHEMISTRY AND MANUFACTURES. Vol. XHV.-No. 24. ] NEW YORK, JUNE 11, 1881. [ #3.20 pel- Annum. [new series.] l_ [postage prepaid.] MACHINES ?0R…
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