The Mechanical Handling and Storing of Material

COAL TIPS OR HOISTS 539 essential feature is the curved rail track, which in this case is portable, running on wheels and on a standard gauge rail track. The curve of the rail track is so chosen that the truck first ascends very gently, and at the extreme end the buffers of the largest truck do not touch the rails. Figs. 752 and 753 show that the truck is first pulled upon a low bogey, to which one axle of the wagon is secured, and also in the highest position where it delivers the load. A-capstan, which is part of the gear of the tip, first pulls the Figs. 756 and 757. Tip at the Liege Gasworks. truck to be emptied on to the bogey, and as soon as it is in that position the hoisting gear is started, and immediately the chains begin to pull, two powerful hooks engage automatically with the front axle of the truck. These two chains are shortened by the hoist until the whole truck with the low bogey have reached the highest point. The unloading takes place between the angles of 45° and 55°. The capacity of such a tip is 150 tons per hour and the electro-motors manipulating it from 15 to 25 H.P., varying with the height of lift. The power consumed for 10 tons unloaded, inclusive of the