go. San Francisco, Toronto. XI. ft.. W .A.XV.XI, .lA-sti, Tei'msof Subscription.—One copy of the SCIex- 1S4 I.al|l^treet, CHICAGO. TiFic American will be sent for one year—52 numbers- WHY DOES STEEL HARDEN? —BY $10.00 to $50.00 I postage prepaid, to any subscriber in the United States er night. A… … struction, the proposed mode of operation being based Mention tbis paper. in size, every number containing sixteen large pages. upon the fundamental ideas of regarding a line as gen- The Scibntipic American Supplicmknt is publtsbed erated by the motion of a point, the tangent as tbe di- COLD AS A…
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