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. 1887 Excerpt: ...of the engines will automatically vary to meet the fluctuating working requirements of the system. The boilers L, situated in the rear of ...
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. 1887 Excerpt: ...of the engines will automatically vary to meet the fluctuating working requirements of the system. The boilers L, situated in the rear of the engines, are by Messrs. Babcock and Wilcox. They afford a duplicate service of 50 horse-power. All the machinery is in duplicate. The engine in service drives, through the spur gearing I i, a countershaft h, on which the cable-driving drum H is fixed, so that the cable is driven at a uniform velocity of from five to six miles per hour, as required. As the cable leaves the drum or pulley H it passes on its way out to the road, over two compensating sheaves M M1 capable of having their axes moved further apart by slides m, and screw spindle gearing m', and by which any permanent slack in the cable (resulting from stretching) may be taken up. Changes in the length of the cable arising from variations of temperature and working strains, are, as before mentioned, compensated by the counter-weighted pulley carriage in the lower terminal pit. The cars used upon the Highgate line are of three types, and demonstrate how any existing rolling stock can be adapted to the system, and that the employment of "dummy cars" (i.e., independent hauling cars for carrying the grippers and other mechanical contrivances), is unnecessary if not unsuitable for traffic in this country. Some of the cars employed on this line are of the ordinary type, with the gripping apparatus worked direct; others are mounted on bogie trucks, similarly equipped and worked; and lastly, some "dummies or auxiliary hauling cars," are employed. The last arrangement may be useful in exceptional cases, but their common use on passenger lines, whether level or of fairly uniform gradients, such as are usually found in this country, appears unnecessa...
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