. Scientific American Volume 90 Number 16 (April 1904) . Computing Figures mentally is probably thehardest kind of toil Comptometer makes iteasy, is twice as quick, in-sures accuracy ana relievesall mental and nervous dont you get one ?Write for Pamphlet, FELT & TARRANT MFCS CO. 62^6 Illinois St., Chicago. THE LOCKE ADDER ^ | CAPACITY 999,999,999 The 86 calculating machine^c which does more work thanI the most expensive. Adds jI 9 columns at once. Hub-^| tracts— Sim AlumiriumModel $tQ0 0 I pie, rapid, I handy. ^cua£ It i CannotIr make mis ftakes-lifetim
. Scientific American Volume 90 Number 16 (April 1904) . Computing Figures mentally is probably thehardest kind of toil Comptometer makes iteasy, is twice as quick, in-sures accuracy ana relievesall mental and nervous dont you get one ?Write for Pamphlet, FELT & TARRANT MFCS CO. 62^6 Illinois St., Chicago. THE LOCKE ADDER ^ | CAPACITY 999,999,999 The 86 calculating machine^c which does more work thanI the most expensive. Adds jI 9 columns at once. Hub-^| tracts— Sim AlumiriumModel $tQ0 0 I pie, rapid, I handy. ^cua£ It i CannotIr make mis ftakes-lifetime. a all you claim for it. I A. R. HARPER, Danville,lll. I We highly recommend it.—J AS. 3 WALLACE & SON, Parnassus, Pa. i 8ize4xlQ;&inches. Price8>.00| prepaid in the U. S. Write! for Free booklet. Agents wanted.; ^. B1F6. tO.,35 WalnotSt.,Kensett,la. |. IFSSOPS STEELS1 \J*~V FOR TOOLS, SAWS ETC. W« JESSOP & SONS US 91 JOHN ST. NEW YORK PRESIDENT SUSPENDERS Comfort Mid service. Guaranteed—All breaks made good; 50c and $ shop or by mail. C. A. EDGARTON MFG. Box 310. Shirley. Mass. © 1904 SCIENTIFIC AMERICAN, INC
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