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. 1912 Excerpt: ...and then withdraws, it fills the whole interior of the tube with gloAving mercury vapor and gives out a very brilliant and steady light. Fig. 91 shows one of the commonest forms of Cooper-Hewitt lamp with its complete mounting. The upper part of the lamp contains inductance coils, an adjustable resistance, an automatic ...
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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. 1912 Excerpt: ...and then withdraws, it fills the whole interior of the tube with gloAving mercury vapor and gives out a very brilliant and steady light. Fig. 91 shows one of the commonest forms of Cooper-Hewitt lamp with its complete mounting. The upper part of the lamp contains inductance coils, an adjustable resistance, an automatic tilting magnet, and, in case of lamps operating in series, a shunt resistance and a cut-out. The lamp shown takes 192 watts at the terminals, the normal current being 3.5 amperes. The light-giving tube is about 22 inches in length between the bulbs and of about 1 inch bore. The mercury electrode is contained in the blackened bulb at the right of the illustration, the blackening being for the purpose of preventing the boiling and bubbling of the mercury in the bulb from making itself visible as a flicker. This particular size of lamp is intended to be operated two in series on the 110-volt circuit. For use singly on 110 volts, tubes of slightly more than double the length are used. When the current is thrown on the lamp is tilted, and, dropping back, starts the arc, which, at first curiously bluish, comes in a minute or so to intense brilliancy and acquires a greenish cast. The light is that of the Fig. 91. mercury spectrum, which for light-giving purposes consists of three intense lines in the yellowish and green, reenforccd by a vivid blueviolet line which is momentarily predominant when the arc first starts. Red is practically absent from the spectrum, the only red lines being too faint to produce any noticeable effect. Though the resulting color of the light is somewhat ghastly and plays curious tricks with colors containing red, the lamp is very powerful and steady, of moderate intrinsic brilliancy, --some 10 to 11 candle power per square...
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.