Lamb's Textile Industries of the United States; Embracing Biographical Sketches of Prominent Men and a Historical Resume of the Progress of Textile Manufacture from the Earliest Records to the Present Time Volume 1

Lamb's Textile Industries of the United States; Embracing Biographical Sketches of Prominent Men and a Historical Resume of the Progress of Textile Manufacture from the Earliest Records to the Present Time Volume 1

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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. 1916 edition. Excerpt: ... the energy is developed entirely due to velocity. Both of these types have the disadvantage, when used under comparatively low and medium heads, that no draft tube can be used with them, consequently that part of the head between the runner and the tailrace is lost. This will be of considerable importance where the head is small and the level of the tailwater is variable, as the head so lost may be twenty-five per cent or more of the total. /here these types of turbines are used under higher heads, the amount so lost is of little consequence, being a very small per cent of the total head. These types of turbines first came into prominence in the western part of this country and in Switzerland. Undoubtedly they would have been developed even if the belief that reaction turbines could not be used under high heads did not exist, because the size of units required at that time was small and some of the heads developed comparatively high. A reaction turbine, having a fixed speed, is limited as to the smallest power it can develop under any given head, so that, leaving out of consideration the question of cost, there is a practically definite point where reaction turbines must be abandoned and impulse or action turbines must be used. However, the question of cost makes it desirable to use impulse or action turbines even for sizes so large that reaction turbines could still be used. Since the development of the electrical generator and electrical transmission of power, it has become desirable to develop large quantities of power in one place, and to develop large powers sometimes under high heads, which were previously inaccessible. It has been found economical to develop these large powers in very much larger units than had previously been...show more

Product details

  • Paperback | 214 pages
  • 189 x 246 x 11mm | 390g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236785282
  • 9781236785282