Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 359
rapidly. 340 Electiicity. [Book III two other methods which hold an intermediate place betweenthese two. All the incandescent lamps (Fig. 219) at present in useconsist of one or more filaments of carbon (a), of horse-shoe form, attached at their ends to stout platinum wires b, c,which are fused… … r~* Fig. 219. fibre which yields the most suitable carbon filament. Theseare .heated (air being excluded) to expel water and gases, andthen compressed in a mould. The chief difference betweenthe lamps in use is the source and mode of preparation ofthe carbon filament, and the nature of the residual…
Electricity
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