La Follette, Robert M. (Robert Marion), 1855-1925, ed, La Follette, Robert M. (Robert Marion), 1855-1925, Handy, William M, Higgins, Charles · Chicago : Making of America · leaf 180
c lights are to-dayoperated by alternating current, a proportion which is due tosecondary rather than to primary causes. The incandescentlamp has undergone in these years a far less extensive evolu-tion than the arc lamp. It is now pretty nearly the same MANUFACTURESVALUE. CAPITAL. WORKERS. IN THE… … I COST OF MATERIAL i IVALUE LESS COST OF MATERIAL QUARTER CENTURY OF ELECTRIC LIGHTING i6i thing that it was ten years ago, save that improvements inmanufacture have rendered the product somewhat moreuniform. Chief among these we must reckon the almostuniversal use of the squirted cellulose…
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