Illustrated Catalogue and Price List of Leffel's American Double Turbine Water Wheel

Illustrated Catalogue and Price List of Leffel's American Double Turbine Water Wheel

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1868 edition. Excerpt: ...constructed Turbine to discharge a quantity of water equal to that which would flow through an orifice of a certain size, under a given fall, and where the discharge is free and unobstructed, the apertures in the wheel must greatly exceed that of the simple orifice. The quantity of water discharged by diiferent Turbines varies according to the construction. The controlling cause of this difference is tho varying forms, curves and angles, given to the guides and buckets. The actual discharge of the Lcflel Wheel is 6-10 of the combined area of its apertures. Suppose weitake a wheel in which the total area of the apertures between its guides amounts to 100 square inches; now this wheel will not discharge a quantity of water equal to 100 square inches, but only equal to 60 square inches. It must be evident to every one that this difference results from the water being retarded in its flow through the guides, by coming in contact with the wheel within the casing. To make this clear, even to those who are not fully versed in hydraulics, let us suppose a wheel, the apertures of whose guides measure 100 square inches, and place it under any given fall; now let us suppose we remove the wheel from out the casing, and open the guides, the water will then flow freely and unobstructed through the guides into the empty space within the casing; as there is nothing to retard its flow, it will rush through the guides with a velocity due to the head under which it is placed. Now, by placing the wheel again within the casing, it acts as a clog or check to the flow of water, as the water comes in contact with the buckets of the wheel, and instead of passing through the guides with the same velocity as before, it is held back so that it now passes through more

Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • United States
  • English
  • black & white illustrations
  • 1236959418
  • 9781236959416