Electricity and Miscellaneous

Electricity and Miscellaneous

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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. 1889 edition. Excerpt: ... away. He Bald that the practical uniformity of measure was shown by the table of trials of the meters, the limit of error allowed being about 2 per cent.; they were made to register a little too much at the lowest speed, which was effected by increasing the drag-vanes beyond what was strictly necessary to counteract the tendency of the orifices in the propeller to form joints; it being manifest that the resistance of the drag-vanes, like the force of the jets, Would increase as the square of the velocity. The G7zairman inquired whether the meters had been employed in regular use for both high and low pressures, and whether they were found to register correctly in both cases? Mr. Siemens replied that many of them were at work under both circumstances, and no difference had been found in their measuring from being worked under different pressures from 300 feet tol foot head of water. There was always a grating fixed vhich prevented the entrance of anything into the meter that would be liable to interfere with its action; and the smaller size of meters had a tubular grating (1 specimen of which was shown), giving a surface of grating mllf-'ll more extended in proportion, which could be easily gob 8? l5 remove the deposits whenever they had accumulated sulficiently 50 obstruct the water. As to the expense, he thought for the smallest class of houses, consuming only 100 gallons per day, Parkins0n's meter would be the cheapest, if the necessity for a cistern and the ascending supply-pipe which it involved were not taken into account; bllli hour, and cost 3 10s., --a 1 inch meter, for 1200 gallons P91' hour, 5 5s., --and a large 10inch meter, to deliver 100,000 gallons per hour, cost 50 01- 6()_ The amount...show more

Product details

  • Paperback | 152 pages
  • 189 x 246 x 8mm | 286g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236833864
  • 9781236833860