centers and intended to lift granulated slag and water to a height that will permit them to flow to the dump or deliver them to the dump pile through troughs carrying scraper

conveyers.

FIG. 32

Sufficient water, with a slight inclination, will move the slag along and a considerable saving may be effected by getting rid of furnace slag in this way. Besides,

the necessity of a slag dumping ground is obviated if there is a good-sized stream or river to dump into.

In the figure, a is a hole leading to a sump which answers as an elevator boot and is kept flushed with water. The slag is dumped into this well from slag carts b and, becoming granulated, is carried by the elevator buckets to the bucket discharge in the house d. The water and slag that the buckets discharge flow together down the trough e to the slag pile or river, as the case may be.

60. The Ligerwood cableways have two towers, between which is stretched a wire rope. In Fig. 33, the poles a will answer for towers. Upon the wire rope b a carriage c runs back and forth, carrying with it a bucket d. The traveling

rope e is attached to one end of a bucket and passes over a pulley f and then between the span and over another pulley leading to the engine room. It is given two or three

turns around the drum, then passes up to another pulley, and so on back to the bucket, making virtually an endless rope. This rope moves the carriage back and forth on the cable b.

The carriage a, shown in Fig 34, is another arrangement for dumping refuse. The carriage runs on rope b; there is a fall rope c, which is connected with the engine at one end and with the bucket at the other. The fall rope passes half around pulley p, then half around the block d, up to pulley f, and then, as shown, down to the bucket at e. The traveling rope g moves the carriage back and forth to the dump, and when it is desired to dump holds it there. The rope c then comes into play and tilts the bucket, allowing the contents to fall on the dump pile. The bucket is next pulled into its normal position and moved back for more refuse by the traveling rope g moving the carriage a.

rope c, which also acts as a haul rope and brings them from a lower level to a higher.

61. Rope Sag Calculations.-While a cable may be made sufficiently taut to answer as a runway for the carriage and car, nevertheless there will be a certain amount of deflection that must not be neglected, otherwise it will

necessitate the shortening of the span or require the tower away from the mill to be the higher. This deflection can be estimated if the length of the span, the weight of the rope, and the weight of the load are known. In Fig. 36

let

s = span or the distance A B between supports;

m and n = arms in feet into which span is divided by a vertical through required point of deflection.r, representing arm corresponding to loaded side;

y= horizontal distance from load to support
corresponding with m;

W = weight of the rope per foot in pounds;
g= load;