By Edwin J. Houston
Electro-T echnical sequence, is written in language reminiscent of will allow most people conveniently to appreciate the prime ideas underlying the paintings of electrical arc lights, with none designated education in electrotechnics. The swift progress of out-door illumination through the arc mild has rendered it an issue of necessity that the general public could be capable of own a extra prolonged wisdom of the rules underlying the construction of the voltaic arc than may be bought from the day-by-day newspapers.
(Typographical blunders above are as a result of OCR software program and do not happen within the book.)
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This ' shifting of the position of the and consequently of the arc, is objectionable from the fact that it leads to crater, an unsteadiness or flickering of the light and a consequent variation in the distributhe light over the surrounding therefore, the flickering is frequent and marked, the effectiveness of the illumination suffers. Various expedition of space. When, ents have been adopted in order to reduce shifting of the arc to a minimum. this Among the most important of these are the reduction of the diameter of the carbon, so as to afford a smaller area over which the arc can shift, and providing the centres of the electrodes with a softer carbon, so as to insure the greatest liberation of carbon vapor from the central por- THE VOLTAIC ARC.
4. CARBON VOLTAIC ARC. shape, the end of the positive electrode being hollowed out in a small crater or cupshaped form while the opposed surface of ; the negative electrode will be seen to have ELECTRIC ARC LIGHTING. 22 a minute projection or nipple formed on that part of its surface directly opposite the It will be evident too, that while crater. the ends of the carbon electrodes are brighter than the mass of the arc proper i. , them, that they are by no means of equal ; brilliancy, the positive carbon being much Moreover, it brighter than the negative.
CHAPTER II. THE VOLTAIC ARC. As ists already mentioned, some doubt exwhen the voltaic arc was first as to would seem that this phenomenon must have been noticed coin- observed, but it cidentally with the use of the first power- ful voltaic battery. When wires or other conductors con- nected with a powerful voltaic battery, or other electric source, are brought together and then slowly separated, the electric cur- rent does not immediately cease to flow; that is to say, provided the wires are not separated too widely, the circuit is not THE VOLTAIC ARC.
Electric Arc Lighting by Edwin J. Houston