A Manual of Mining Based On the Course of Lectures On Mining Delivered At the S

Magnus Colbjrn Ihlseng

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These fans include the Waddle, Biram, Naysmith, and Hopton patterns, all of which are essentially similar to the first named. The Waddle is a self-contained fan, in that there is no fixed casing, and the whole machine re- volves. Its form is practically that of a light hollow disc of wrought iron, the blades and casing being wholly riveted together. The air enters by a straight lead at one side only, and passes through curved and gradually narrowing channels to the cir- cumference, the blades b...eing bent at first to incline slightly back- wards, the alternate blades extending not more than one half the distance between the circumference and the inlet. The passages, by their contraction, are so made that the circumference at any point multiplied by the cross-sectional area at that point is a constant quantity. The outer circumference of the fan is bell- mouthed.
A fan of 9 feet diameter circulates 80, 000 cu. Ft. With a water- gauge of 2 inches. One of 45 feet, driven by an engine with 40" X42" cylinder, at a boiler pressure of 80 Ibs.

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