This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...with the outgoing rope. Carriers are hung on to the rope at intervals, and the rope moves at a slow even speed, say three or four miles per hour, delivering a regular supply of full carriers at one end and bringing back on its return journey a regular supply of empty carriers. The engine is generally similar in type to ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...with the outgoing rope. Carriers are hung on to the rope at intervals, and the rope moves at a slow even speed, say three or four miles per hour, delivering a regular supply of full carriers at one end and bringing back on its return journey a regular supply of empty carriers. The engine is generally similar in type to the ordinary hauling engine with drum 6 to 12 feet in diameter. The posts are erected at intervals of 150 to 400 feet according to the state of the ground over which the ropeway passes, pulleys being fixed at the ends of projecting arms; the posts are made sufficiently high to enable the carriers easily to clear obstacles on the ground. The endless rope system may again be divided into two forms--in one case the carriers are attached to the rope simply by frictional contact, in the other they are firmly secured to the rope by means of a steel band. (a) Frictional Contact (Fig. 118).--The carriers are suspended from the rope by a curved hanger, and the upper end of this hanger is attached to an inverted V-shaped saddle resting on the rope. The weight of the carrier and its load is sufficient, with ordinary gradients, to cause the rope to convey Flg. 118.--Aerial Ropeway. carrier and material without any additional connection. Two small wheels are also fitted near the V saddle, and these enable the carrier, when it arrives at either terminus, to be run Fig. 119.--Aerial Ropeway. on to the terminal rails or shunts as desired. This system is very suitable for supplying 300 or 400 tons a day on gradients of not more than, say, 1 in 4 or 1 in 5, where the lengths of spans are not greater than the distances already mentioned, and where the carrying capacity of each bucket is not required to be more than 5 cwts. (b) The Fixed Grip.--This method (Fig....
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Add this copy of The Principles and Practice of Coal Mining to cart. $21.42, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
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New. Trade paperback (US). Glued binding. 376 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
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