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. 1841 edition. Excerpt: ...necessary to add the tender, and the machine iscomplete. THE TENDER: WEIGHT OF ENGINE, &C. The tender consists of a wrought iron tank, placed.upon a strong frame-work of timber, which is supported and conveyed upon 4 or 6 wheels, as may be required, according to its weight. The axles, axle boxes, guard plates, ...
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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. 1841 edition. Excerpt: ...necessary to add the tender, and the machine iscomplete. THE TENDER: WEIGHT OF ENGINE, &C. The tender consists of a wrought iron tank, placed.upon a strong frame-work of timber, which is supported and conveyed upon 4 or 6 wheels, as may be required, according to its weight. The axles, axle boxes, guard plates, springs, &c, being similar to those upon the engine, it is quite necessary, for the sake of safety, to have them of a proper tension. Tenders are generally made sufficient to contain from 700 to 800 gallons of water, and from 10 to 12 cwt. of coke, this being about the necessary expenditure for a 30 mile trip of an engine containing 12 inch cylinders and 18 inch strokes. An engine of this description, when fully equipped with coke and water, is about 12 tons in weight, and the tender similarly situated is about 6J. The weight of the engine upon the driving wheels is about 6 to 7 tons. PRELIMINARIES CALCULATION OF USEFUL EFFECT m LOCOMOTIVE ENGINES. In order to determine the useful effect of a locomotive engine, it is necessary to observe that 6 lbs. per ton of its own weight is expended in overcoming the friction of its parts; 9 lbs. per ton of gross load for horizontal traction and additional friction which is caused to the engine by the load; and 14.7 lbs. per square inch, the pressure of the atmosphere. These being premised, the following calculations are easily determined: 1. The weight of an engine, tender, and load, being given, also the dimensions of cylinders and diameter of driving wheels, to find the force of steam required to overcome that resistance: Rule.--To the gross load of the train in tons, multiplied by 9, add the friction of the engine, --multiply that sum by the diameter of the driving wheels in inches, divide...
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