The Mechanical Handling and Storing of Material

744 INDEX Worm conveyors, intermediate bearings of, 49, 50, 51 --------outlets for, 54 -----length of, 45 -----methods of producing closed spiral for, 44 -----pitch of, 45, 46 -----power required for, 48, 49, 142 — troughing of, 49 — — with cast-iron blades on square spindles, 43 Worm conveyors, tubular, 53 --------speed and capacity of, 55, 60 Worral, J. & J. M., ropeway of, 306 Woven wire belt conveyors, 83 Wright, J. & E., ropeway installations by, 306 Wrightson’s coal shipper, 600 Wybe, Adam, early ropeway erected by, 263 YOUNGSTOWN Sheet and Tube Co., test made with lifting magnet at, 414 Ysselsteijn, H. A. van, electrically driven coal tip at Rotterdam designed by, 566 ZEITSCHRIFT des Vereines N Ingenieure, 29, 73, 395, 410, 416, 536, 566, 594, 595, 611, 619, 663 Zimmer conveyor, 111, 453, 649 -----angle station for, 113 — — as a feeding device, 27 -----as a picking table, 116 -----capacity of, 115 — — for draining washed coal, 116 -----for feeding boiler-houses, 637 -----intermediate delivery from* 114 -----power required for, 115, 142 — — speed and rate of travel, 114 -----wear and tear of, 143 -----Weiss feeding appliance for, 118 Zürich Gasworks, transporters at the, 450 deutscher 455, 462,