id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
17625	Luckiesh, Matthew	Artificial Light: Its Influence upon Civilization			.txt	text/plain	97999	5046	64	treat of the development of artificial light up to the present time. The highly developed artificial lighting of the present time may In order that oil-lamps may produce a brilliant light free from smoke, Furthermore, gas-lighting was an improvement over candles and oil-lamps of artificial lighting per day, the relative cost of gas-and gas-light remained for a long time the only illuminant supplied by a gas-lighting, because when it appeared electric lamps had already been designing direct-current arc-lamps, for inasmuch as most of the light uneconomical to use carbon lamps for general lighting purposes. This open-arc lamp was the first powerful light-source available and, light-source, compared with the arc-lamp, but it had the advantage of appeared, that this type of light-source could compete with arc-lamps on In 1848 the first electric arc lamp used for general lighting was light from incandescent lamps at the present time is only a small	./cache/17625.txt	./txt/17625.txt