Papers on the Electric Light for Railway Trains

Papers on the Electric Light for Railway Trains

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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. 1901 edition. Excerpt: ... not yet obtained its average value, and it is not thought that this result is desired so much as the variation in the body of the car. The values of the larger divided by the smaller at the point of greatest variation, omitting end seats, are as follows: 1. Electricity 1.25 2. Gas and electricity 1.31 3. Gas 1.63 4. Oil 1.84 5. Carbureted air 2.33 The great advantage of electric light is here shown, as it comes first in point of uniformity, a result of using many lamps of small candle-power instead of a few lamps of large candle-power. In general lighting practice it is found that an illumination of one candle-foot gives a fairly good light for reading, while one-half a candlefoot may be used, and one and one-half gives what may be called a very fine light. Anything below a half-candle-foot would be called a very poor light, and anything above one and one-half is good mainly for advertising purposes, although it adds to the pleasure and comfort of a traveler to a certain degree. In comparing the different kinds of light, the general results may be stated as follows: OIL. This gives in some respects the most uniform light, in that there is little choice between the wall and aisle seats; but as a whole its uniformity is not marked, coming fourth both in regard to its maximum variation as a whole and as to adjacent seats. The illumination as a whole is also poor, the average in seven curves being only 0.545 candle-feet, which is such as to make reading possible without a marked degree of discomfort, although hard on the eyes. The best curves show an average illumination of one candle-foot, which is fairly good. GAS. This gives a curve better than oil in respect to maximum variation, both as a whole and between adjacent seats. It gives an average...show more

Product details

  • Paperback | 46 pages
  • 189 x 246 x 3mm | 100g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236635027
  • 9781236635020