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 band, 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 g FIG. 34 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, 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. FIG. 35 In Fig. 35 is shown another carriage a, which travels down an inclined rope b. The loads are raised by means of the fall 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 This deflection can be necessitate the shortening of the span or require the tower away from the mill to be the higher. estimated if the length of the span, the and the weight of the load are known. let weight of the rope, In Fig. 36 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, representing arm corresponding to loaded side; y = horizontal distance from load to support corresponding with m; W= w weight of the rope per foot in pounds; If tension is required for a given deflection, transpose / and / in the above formulas. (Trenton Iron Company.) WEIGHT OF WIRE ROPE 62. To obtain the weight per foot of wire rope of any diameter, let Then wweight per foot; D = diameter of the rope in inches. For ordinary wire rope with hemp core, w = For solid round bar, 1.57 D2. W = 2.5 D2. w = 2.62 D2. THE HUNT ELEVATOR AND AUTOMATIC RAILWAY 63. The Hunt elevator and automatic railway is operated by gravity, needing neither steam, horse, nor manual power. It requires power, however, to raise material to the car. This car, Fig. 37, is arranged to run on a railway track, as shown, and is discharged by means of the tripping block a, placed on the track where the load is to be dumped. The sides are not fastened to the car, but to each other, so that if one is unfastened both are. The load is thus evenly discharged and without danger of overturning the car, although |