The Commercial Business Aspects of Municipal Electricity Supply a Practical H
The Commercial Business Aspects of Municipal Electricity Supply a Practical H
Alfred H Gibbings
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These, again, may be sub-divided according to the particular forms of filament adopted in each class respectively. Each of these many and various arrangements has 156 advantages peculiar to itself, and, in the interest of the purchaser and user, it will be as well to consider briefly the points and conditions where one form would be more suitable than another. We will, first of all, deal with the double-filament high-voltage lamp, as that was the first form adopted, and still continues to be th...e PARALLEL SAME PLANE FIG. 17. more general method of the two. In this type, the filaments are arranged either in the same plane with each other, or are parallel to one another, and these are illustrated diagrammatically in Fig. 17. Incidentally we may remark that the drawings do not represent the actual form of lamp of any particular manufacturer. 157 It will be readily seen, from the four examples in this figure, that a very much greater space in the globe is occupied by the double filaments than is usually required for 100 volt lamps.
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