The Mechanical Handling and Storing of Material

ROPEWAYS 277 double ropeway is under certain circumstances subjected to greater and always to more or less unequal wear. It appears, therefore,—and this is borne out by practical results,—that there is not much to choose as to the expense of rope renewals, provided that both types are designed equally skilfully, and that no excessive loads or spans are attempted. Installations by Ropeways, Ltd. The attention of Ropeways, Ltd., of which Mr J. Pearce Roe is managing director, has been chiefly confined to the design and construction of installations on the single Fig. 403. Quadruple Balanced Beam and Sheaves. or mono-cable system, and the double or bi-cable type is only used by them where short lines of heavy capacity are required. By careful attention to details, this firm have mono-cables running which are carrying 150 tons per hour, working grades exceeding 1 in 2 over rough and mountainous country. The saddle which enables them to negotiate such steep gradients is shown in Fig. 401.