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Updated: June 3, 2025
The most common illuminant consists of grease candles, supported on high candlesticks, of wood or brass, but sometimes oil cup-lamps are found, like those we use for night-lights. The latter, however, do not give out much light, and so candles, which are marvellously cheap, are preferred, although unfortunately they melt quickly, and smoke and smell in a dreadful fashion.
This calcium carbide is the basis of acetylene gas, a powerful illuminant, and it is widely used in metallurgy, for welding and other purposes. At the same time with these developments the value of the alternating current came to be recognized.
You can get a startling illuminant if you suspend a test-tube containing sulphuric acid in a vessel of chlorate of potash, and it will be all the better if you add a little common sugar and salt.
There is some prospect of the luminosity excited in a vacuum tube by the alternating currents from a dynamo or an induction coil becoming an illuminant. Crookes has obtained exquisitely beautiful glows by the phosphorescence of gems and other minerals in a vacuum bulb like that shown in figure 69, where A and B are the metal electrodes on the outside of the glass.
This report informed Bissell that the substance, could be refined cheaply and easily, and that, when refined, it made a splendid illuminant, besides yielding certain byproducts, such as paraffin and naphtha, which had a great commercial value.
Readers who know the Morse code might well go to the trouble of constructing in duplicate the simple apparatus to be described, as the possession of an outfit will enable them to extend their signalling capabilities. The stand for the lamp is admirably supplied by the ordinary camera tripod. For the illuminant we may select any good acetylene cycle lamp.
This was done, and the astonished professor found that here was an oil, whose source he could only guess, which made a splendid illuminant and which also seemed to have some medicinal properties. The oil was from Oil Creek, Pennsylvania, and Townsend, associating with himself a conductor named E. L. Drake, formed the Seneca Oil Company and began gathering the oil by digging trenches.
At the dividing-line, where the path parted to the men's and to the ladies' dressing-rooms, he perceived a ghostly figure in the obscurity which also prevailed here from the general extinction of the illuminant.
But, on the other hand, we must not forget that this is the form best adapted for overhead burners, and that nearly every form of regenerative lamp can be adapted as a ventilating agent, and that with the withdrawal of the products of combustion from the air of the room, the great and only serious objection to gas as an illuminant disappears.
The lavish use of electricity, both as an illuminant and as a motive power, combines with its climate, its situation, and its architecture to make New York one of the most fascinating cities in the world. Why, good Americans, when they die, should go to Paris, is a theological enigma which more and more puzzles me.
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