Manne Iron Works. Chicago. Cstalogue free. “U. S.” metal polish. In lanapois Samples free. Presses & Dies. .Ferracutp Mach. Co., Bndgeton. J. Dynamo castings. TheE. M. Wks.. Ronceverte. W. Va. Handle & Spoke Mcby. Ober Lathe Co.,Obaenn Falls.O. Screw machines, milling maenmes, ana drill presses. Tbe Garvin Mach. Co.. I.ai"ht and Canal Sts..New York. Use the Hou"h Seeu ity Cash Recorder. Entlrely dif_ ferent from a Ca.h Re"lster. Hou"b Ca.b Recorder Co., Soutb Butler. N. Y. 'rbe be.t book for electrICians and beginners in elec-t"iclty I. " Kiperimental Science:'by Geo. l1. Hopkins. By mail. $4; liunn & Co.. puhll.hers, 361 Broadway. N. Y. nnSend for new and complete catalogue of scientific and other Books for sale by Slunn & Co.. 361 Broadway, New York. fpp on application.