Chemical Technology

Chemical Technology

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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. 1900 edition. Excerpt: ...passed the "Sale of Gas Act," by which the standard cubic foot for gas measurement was fixed as equal to 62.321 lbs. of distilled water, weighed in air at the temperature of 62 F., under a barometric pressure of 30 inches. Under its provisions public inspectors were appointed throughout the country for the examination and stamping of gasmeters, and standard testing gasholders--to which have since been added standard testing meters--certified as being correct by the Astronomer Royal, were lodged at the Exchequer. These are employed for verifying all testing gasholders and meters used by inspectors appointed under the Act, which must all bear the Exchequer stamp. The Act also defines the tests to which every meter must be subjected before stamping. It orders that the test for capacity shall be made at five-tenths pressure while the gas is passing through the meter at the rate per hour stated thereon as its proper working speed, and no meter may be stamped if it shows a variation of more than 2 per cent. fast or 3 per cent. slow. To comply with these requirements it is necessary that when the water level is raised high enough for the meter to register 2 per cent. fast, the water should overflow the pipe H, Fig. 176 N Hunt's Compensating Meter. (p. 189), and when it has fallen low enough for the meter to register 3 per cent. slow, the float G should fall and close the valve. With such narrow limits, however, much inconvenience is caused to the consumer on any access of pressure, by the partial closing of the valve, and to remedy this Pinchbeck introduced the improvement which is shown in Figs. 182 and 183. The gas Fig. 1S3. Pinchbeck's Meter. passes through the valve, as in Figr. 183, but instead of filling the front chamber it passes into...show more

Product details

  • Paperback | 136 pages
  • 189 x 246 x 7mm | 254g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236551400
  • 9781236551405