The Manufacture of Light; a Lecture Delivered At the Meeting of the British Association At York

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1863°, absolute), the quality of the light more nearly corresponded to that from a black body at 2450°, absolute.
High - pressure Incandescent Gas - lighting. — A still further advance has been made of late in the use 4 8 THE MANUFACTURE OF LIGHT of high-pressure gas-burner's. The usual pressure at which gas is supplied to our houses is quite low — about equal to the pressure of a column of water 2 to 2 J inches high. But if the gas is compressed to a pressure of 40 or 50 inches of water, and s
...upplied under that pressure to appropriate atmospheric burners, it mixes Fig. 20. — Colonia Gas Compressor for High-pressure Incandescent Gas-lighting.
still more completely with the air, the temperature of combustion is raised still higher, and a still greater luminosity of the mantle results. It is this kind of incandescent gas-light which is rapidly coming into favour for lighting of squares and streets. And no wonder. Pro- fessor Wedding's tests on the high-pressure "Millennium light" show 1320 candle-power horizontally, or 933 candle-power spherically, with a consumption of 25 cubic HIGH-PRESSURE INCANDESCENT GAS-LIGHTING 49 feet per hoar of normal gas.


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