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pended in producing the light and also the energy equivalent of each spherical Hefner unit evolved have been published by H. Lux, whose results follow:
_______________________________________________________________________ | | | | | | | | Ratio of | Ratio of | Mean | Energy | | | Light | Light | Spherical | Equiva- | | Light. | emitted to | emitted to | Illuminat- | lent to 1 | | | Total | Energy | ing Power. | Spherical | | | Radiation. | Impressed. | Hefners. | Hefner in | | | | | | Watts. | |____________________|____________|____________|____________|___________| | | | | | | | | Per Cent. | Per Cent. | | | | Hefner lamp | 0.89 | 0.103 | 0.825 | 0.108 | | Paraffin lamp, 14" | 1.23 | 0.25 | 12.0 | 0.105 | | ACETYLENE, 7.2 | | | | | | litre burner | 6.36 | 0.65 | 6.04 | 0.103 | | Coal-gas incandes- | | | | | | cent, upturned | 2.26-2.92 | 0.46 | 89.6 | 0.037 | | " incandes- | | | | | | cent, inverted | 2.03-2.97 | 0.51 | 82.3 | 0.035 | | Carbon filament | | | | | | glow-lamp | 3.2-2.7 | 2.07 | 24.5 | 0.085 | | Nernst lamp | 5.7 | 4.21-3.85 | 91.9 | 0.073 | | Tantalum lamp | 8.5 | 4.87 | 26.7 | 0.080 | | Osram lamp | 9.1 | 5.36 | 27.4 | 0.075 | | Direct-current arc | 8.1 | 5.60 | 524 | 0.047 | | " " enclosed | 2.0 | 1.16 | 295 | 0.021 | | Flame arc, yellow | 15.7 | 13.20 | 1145 | 0.041 | | " " white | 7.6 | 6.66 | 760 | 0.031 | | Alternating- | | | | | | current arc | 3.7 | 1.90 | 89 | 0.038 | | Uviol mercury | | | | | | vapour lamp | 5.8 | 2.24 | 344 | 0.015 | | Quartz lamp | 17.6 | 6.00 | 2960 | 0.014 | |____________________|____________|____________|____________|___________|
CHEMICAL PROPERTIES.--It is unnecessary for the purpose of this work to give an exhaustive account of the general chemical reactions of acetylene with other bodies, but a few of the more important must be referred to. Since the gases are liable to unite spontaneously when brought into contact, the reactions between, acetylene and chlorine require attention, first, because of the accidents that have occurred when using bleachi