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Electric illumination by reflection
Feb., 1883.]
Electric Illumination by Reflection.
101
for every cubic ibot of ammonia evaporated. To abstract 3397 heat units would therefore require the evaporation of 191 cubic inches of" liquid ammonia, corresponding to 95,616 cubic inches of vapor, which must be removed by the pump per minute. Supposing the pump to make one hundred revolutions, if doubleacting it would only need to have a capacity of 478 cubic inches, say 8 inches diameter by 10 inches stroke. Verifying what has been previously said about the small size of the apparatus. The ~nitial pressure corresponding to 0 ° Fahr. is about 30 pounds absolute, and the final, corresponding to 100 ° Fahr., about 200 pounds" absolute, giving a ratio of compression of 6~, and a mean effective pressure of 57 pounds per square inch, which ibr the above piston speed~167 feet per minute, and piston area~50~ square inches--would give a resistance of 14.~ horse power, which by adding 15 to 20 per cent. ibr prejudicial resistance will give the indicated horse power of the steam engine required to run it. Additional power might be needed fi)r the purpose of circulating water, etc., depending on the locality and the purpose for which the cold was intended; but iu any case the available mechanical energy being known, the amount of cold it can produce may be easily calculated, and the results, as obtained in practice, sustain the truth, not only of the possibility, but also of" the magnitude of the conversi(m of mechani(.al energy into cold.
Electric Illumination by Reflection.--D. V. Partz exhibited a plan of a new mode of electric lighting, at tile French Electric Exposition. The light was placed in chambers underneath the street, and reflected through hollow cylinders, enamelled on the inside, so as to produce an inverted cone of rays, which strike a reflector placed at a height of 40 or 50 metres above the street. Among the advantageS which are claimed by the inventor are: The employment of powerful electric foci, thus avoiding the loss which results from the division of the current ; the equal diffusion of the light and the avoidance of the dazzling glare; the diminution of the loss of light, which results from the emph)yment of translucent globes ; the readiness of access for regulation and surveillance; and the illumination of thick mists, which can be penetrated with difficulty by other methods.--La Lumi~re Electrique, Aug. 5, 1882.
Electric Illumination by Reflection.
101
for every cubic ibot of ammonia evaporated. To abstract 3397 heat units would therefore require the evaporation of 191 cubic inches of" liquid ammonia, corresponding to 95,616 cubic inches of vapor, which must be removed by the pump per minute. Supposing the pump to make one hundred revolutions, if doubleacting it would only need to have a capacity of 478 cubic inches, say 8 inches diameter by 10 inches stroke. Verifying what has been previously said about the small size of the apparatus. The ~nitial pressure corresponding to 0 ° Fahr. is about 30 pounds absolute, and the final, corresponding to 100 ° Fahr., about 200 pounds" absolute, giving a ratio of compression of 6~, and a mean effective pressure of 57 pounds per square inch, which ibr the above piston speed~167 feet per minute, and piston area~50~ square inches--would give a resistance of 14.~ horse power, which by adding 15 to 20 per cent. ibr prejudicial resistance will give the indicated horse power of the steam engine required to run it. Additional power might be needed fi)r the purpose of circulating water, etc., depending on the locality and the purpose for which the cold was intended; but iu any case the available mechanical energy being known, the amount of cold it can produce may be easily calculated, and the results, as obtained in practice, sustain the truth, not only of the possibility, but also of" the magnitude of the conversi(m of mechani(.al energy into cold.
Electric Illumination by Reflection.--D. V. Partz exhibited a plan of a new mode of electric lighting, at tile French Electric Exposition. The light was placed in chambers underneath the street, and reflected through hollow cylinders, enamelled on the inside, so as to produce an inverted cone of rays, which strike a reflector placed at a height of 40 or 50 metres above the street. Among the advantageS which are claimed by the inventor are: The employment of powerful electric foci, thus avoiding the loss which results from the division of the current ; the equal diffusion of the light and the avoidance of the dazzling glare; the diminution of the loss of light, which results from the emph)yment of translucent globes ; the readiness of access for regulation and surveillance; and the illumination of thick mists, which can be penetrated with difficulty by other methods.--La Lumi~re Electrique, Aug. 5, 1882.