Technology Quarterly and Proceedings of the Society of Arts Volume 3

Technology Quarterly and Proceedings of the Society of Arts Volume 3

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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. 1890 edition. Excerpt: ... 70 & 90 m no Afinutef. tional amount of carbonic acid is removed, and the water will then color phenolphthalein. The rate of removal of carbonic acid, after reaching the point where it is equivalent to twice the base, is many times slower than before. To this point the rate is equal to the rate of removal from distilled water containing as much carbonic acid as there is here excess over twice the equivalent of base. These experiments show the existence of real bicarbonates of calcium and magnesium. They also indicate that these bicarbonates are slightly dissociated by water, as is also sodium bicarbonate in equal dilution. Lawrence Experiment Station, Mass. State Board of Health. DATA AND PLOTS OF VARIOUS INCANDESCENT LAMPS, TOGETHER WITH AN IMPROVED METHOD OF TESTING.1 PART II. BY WM. L. PUFFER, Instructor In Physics. The object of this investigation was to determine the efficiencies of various makes of incandescent lamps. The method used was similar to, but in all respects an improvement upon, that used in 1885 by the Franklin Institute. The component measurements to be made are these: --1. The current passing through the lamp. 2. The difference of potential between the lamp terminals. 3. The required photometer readings. The current was determined by a Thomson current galvanometer placed in series with the lamp and an adjustable resistance for regulating the potential. The difference of potential was determined by a Thomson potential galvanometer of 7,500 ohms resistance connected with the terminals of the lamp. Great constancy of potential was rendered possible by the use of an automatic governor designed and built by the department. The current readings were corrected by deducting the current flowing through the potential galvanometer....show more

Product details

  • Paperback | 120 pages
  • 189 x 246 x 6mm | 227g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236594339
  • 9781236594334