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.."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.