Comparative Tests of Carbon Metallized Carbon And Tantalum Filament Lamps
Comparative Tests of Carbon Metallized Carbon And Tantalum Filament Lamps
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24, indicate that the tantalum filament has a lower and the metallized a high- er emissivity than the carbon filament. Since emissivity is vital- ly connected with the light efficiency of an incandescent body, the difference in the relative positions of the emissivity curves of the metallized and tantalum lamps with respect to the carbon seems to indicate that a part of the better efficiency of the two newer fil- aments is due to different causes.
The tantalum filament, having a lower emissivit...y than the carbon filament, requires less energy to maintain the same tem- perature than the carbon; that is, the lower emissivity of the tan- talum filament gives it a better efficiency than the carbon at the same temperature. This is in addition to the fact that tantalum has a greater atomic weight and a higher vapor tension point than carbon, thus allowing it to be operated at a higher temperature with the consequent better efficiency.
Since the metallized filament has a higher emissivity than the carbon filament it must require a greater input of energy per square inch of surface to maintain a given temperature.
What to read after Comparative Tests of Carbon Metallized Carbon And Tantalum Filament Lamps?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Hamer Amrine to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
24, indicate that the tantalum filament has a lower and the metallized a high- er emissivity than the carbon filament. Since emissivity is vital- ly connected with the light efficiency of an incandescent body, the difference in the relative positions of the emissivity curves of the metallized and tantalum lamps with respect to the carbon seems to indicate that a part of the better efficiency of the two newer fil- aments is due to different causes.
The tantalum filament, having a lower emissivit...y than the carbon filament, requires less energy to maintain the same tem- perature than the carbon; that is, the lower emissivity of the tan- talum filament gives it a better efficiency than the carbon at the same temperature. This is in addition to the fact that tantalum has a greater atomic weight and a higher vapor tension point than carbon, thus allowing it to be operated at a higher temperature with the consequent better efficiency.
Since the metallized filament has a higher emissivity than the carbon filament it must require a greater input of energy per square inch of surface to maintain a given temperature.
What to read after Comparative Tests of Carbon Metallized Carbon And Tantalum Filament Lamps?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Hamer Amrine to read onlineMoreLess
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