. Electrical world. which has been found available. EFFICIENCY OF THE NERKST LAMP. When we come to the subject of the economy of the Nernst lampquite an array of diverse opinion is presented. Drude, the distin-guished German physicist, credits the Nernst glower with an absoluteluminous efficiency of 12 per cent., the corresponding efficiency of theincandescent lamp filament being variously stated by authoritiesat from per cent, to per cent.: on the other hand, the claimhas been made by an incandescent lamp interest that the efficiencyof the Nernst lamp in commercial service is practica
. Electrical world. which has been found available. EFFICIENCY OF THE NERKST LAMP. When we come to the subject of the economy of the Nernst lampquite an array of diverse opinion is presented. Drude, the distin-guished German physicist, credits the Nernst glower with an absoluteluminous efficiency of 12 per cent., the corresponding efficiency of theincandescent lamp filament being variously stated by authoritiesat from per cent, to per cent.: on the other hand, the claimhas been made by an incandescent lamp interest that the efficiencyof the Nernst lamp in commercial service is practically the sameas that of the ordinary incandescent lamp. If, however, we accept Tumlirzs constant of for the number of candles per watt for aluminous efficiency of 100 per cent, a incandescent lamphas a luminous efficienty of per cent, and a Nernst glower of 12per cent, luminous efficiency corresponds to a consumption of per one refers to the candle power that have been. FIG. 10.—TESTING B.\LLASTS. made on the commercial Nernst lamp, the results are apt to be socontingent on the experimenters interpretation of what constitutesa candle power—whether it is to be considered in a spherical, hemis-pherical or some other significance—that the data are of little valuefor comparative purposes. It happens, however, that the Photo-metric Committee of the National Electrical Light Association hasreported on measurements of the Nernst lamp in such a form that acomparison can be made between the performance of this lamp andthat of arc lamps tested by the same committee and presurqably ac-cording to the same methods. According to this report, the wattsper hemispherical candle power consumed by a six-glower lampwere per cp. with clear globe as compared with the followingenclosed arcs with opal inner globes and clear outer globes: Direct-current series, watts; direct-current multiple, watts; alter-nating-current series, wat
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
