Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 3, 2025
Despite its splendour, it is a very feeble illuminant. If we move a Glow-worm along a line of print, in perfect darkness, we can easily make out the letters, one by one, and even words, when these are not too long; but nothing more is visible beyond a narrow zone. A lantern of this kind soon tires the reader's patience. Suppose a group of Glow-worms placed almost touching one another.
It has for the hemoglobin of the blood four hundred times the affinity of oxygen, and a proportion of only two tenths of one per cent may produce heart derangement. While we are wondering that we are alive in the face of such dreadful facts, we may note further that gas is rather variable in its qualities as an illuminant.
It is as though a man should go hunting his house for a light with a candle burning in his hand. What on earth can we be searching for when the "candle of the Lord," as Locke called it, is the very illuminant we must employ in our search? "Tell me," Emerson would ask, "the truths your sciences establish, the principle of your philosophies, are they valid for all intelligences or only some?"
An ordinary room, say 16' X 12' X 10', would not be considered properly illuminated unless the light were at least equal to 32 candle power; and in the table below the amount of the oxygen used up and the products of combustion formed by each class of illuminant and burner in attaining this result are given, the number of adults who would exhale the same amount during respiration being also stated.
As time passed, and the new illuminant was backward in appearing, the shares recovered their old value. Edison was severely blamed for causing the disturbance; but, nevertheless, his announcement had been verified in all but the question of cost. The introduction of a practical system of electric lighting employed his resources for several years.
Might it be not otherwise with the imaginative, the intellectual, heat and light; the real need being that of an interpreter Apollo, illuminant rather as the revealer than as the bringer of light?
It didn't occur to her to ask how much the rent would be, nor would the fact have had any value for her as an illuminant, because she would have had no idea whether six thousand dollars was a half or a hundredth of her future husband's income.
And the same cause which brings about these extreme cases, on a smaller scale causes such physical discomfort to many delicately organized persons that a large class exist who absolutely and resolutely decline to have gas as an illuminant or fuel in any of their living rooms; and if the use of gas, more especially as fuel, is to be extended, and if gas is to hold its own in the future against such rivals as the electric light, then those interested in gas and gas stoves must face the problem, and by improving the methods of burning and using gas do away with the present serious drawbacks which exist to its use.
It is now a fact that a body may be rendered incandescent or phosphorescent by bringing it either in single contact or merely in the vicinity of a source of electric impulses of the proper character, and that in this manner a quantity of light sufficient to afford a practical illuminant may be produced.
Although oil had long been a recognized illuminant from which a good artificial light could be obtained, it was not until the eighteenth century that any marked attempt was made to substitute oil for candles in this country.
Word Of The Day
Others Looking