Practical Electric Illumination

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. 1917 Excerpt: ...part of the lamp shell constitutes a condensing chamber for the lighter fumes from the arc. In operation the lighter fumes rise up into this chamber and deposit on its cooler surfaces. By reason of the large surface and the absorbing material in the condensing chamber, it is not necessary to clean it except at long ... Read More

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. 1917 Excerpt: ...part of the lamp shell constitutes a condensing chamber for the lighter fumes from the arc. In operation the lighter fumes rise up into this chamber and deposit on its cooler surfaces. By reason of the large surface and the absorbing material in the condensing chamber, it is not necessary to clean it except at long intervals. This condensing chamber is separated from the mechanism chamber by a casting, and can be readily cleaned out by the trimmer without removing any part but the globe. The lower part of the globe acts as a condensing chamber for the heavier fumes. As the upper portion of the globe is warm, it attracts no deposit and remains clean to the end of the trim. The dimensions of the upper carbon are as shown in Table 193. The lamps can be arranged to operate on standard commercial circuits of any voltage, direct or alternating current. In multiple alternating-current lamps the current is 10 amp. and the voltage 43. An auto-transformer mounted in the top of the lamp steps down the voltage from 110 to that required by the arc. The luminous efficiency of the lamp is 0.25 to 0.40 watt per mean lower hemispherical candle-power. The important features of this type of lamp are its high luminous efficiency; the comparatively low maintenance cost; the superior distribution of light for large areas, and the flexibility of design which adapts the lamp for operation on standard voltages of commercial circuits, both alternating and direct current. The lamp is deserving of special consideration in extensions and particularly for street and industrial illumination. s 194. Regenerative Arc Lamps.--The so-called "regenerative" arc lamp (Fig. 104) is a flame arc lamp with its air currents so directed that the fumes from the arc are returned to the arc ch... Read Less