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No shelves should be placed higher than can be reached by hand without mounting upon any steps or ladders; i. e., seven to seven and a half feet. The system of shelving should all be constructed of iron or steel, instead of surrounding the books on three sides with combustible wood, as is done in most libraries.
The only inert and useless gas in an arrangement like this is the nitrogen of the air, which being in large quantities does act as a serious diluent. To diminish the proportion of nitrogen, steam is often injected as well as air. The glowing coke can decompose the steam, forming carbonic oxide and hydrogen, both combustible.
Remembering the quantity of combustible objects in the vestry the straw, the papers, the packing-cases, the dry wood, the old worm-eaten presses all the probabilities, in my estimation, point to the fire as the result of an accident with his matches or his light.
"These," said he, "are the great vents appointed by nature for the discharge of that rarefied air and combustible matter, which, if confined, would burst the globe asunder; but, besides the larger outlets, there are some small chimneys through which part of the heat transpires; a vapour of that sort, I conceive, must pass through the bed or channel of this spring, the waters of which, accordingly retain a moderate warmth."
He tied fagots across their horns, filling the fagots with pitch, so as to make them highly combustible. In the night on which he was going to attempt to pass the defile, he ordered his army to be ready to march through, and then had the oxen driven up the hills around on the further side of the Roman detachment which was guarding the pass. The fagots were then lighted on the horns of the oxen.
Make your line long enough, and from all your boats let the men throw grappling-irons; and then, having made fast the enemy's ships, set fire to all your own boats, having previously filled them with combustible materials, and let your men escape in one reserved for the purpose." "Oh!" cried William, "I see the whole French fleet burning."
By the aid of these convolutions any person of Jupiter can tell in daylight or darkness the nature of any surrounding substance, whether it be hard or soft, combustible or non-combustible, good for food or not. I confess that I was unable to grasp the idea intelligently. So the people on the Moon had the same difficulty in understanding the use of my nose.
This combustible was concealed with great care in the captured ships; like the red-hot shot, it had been found useless in battle.
Wooden houses of many various colors were devoured in a few moments, and had already fallen in; magazines of oil, brandy, and other combustible materials, threw out flames of a lurid hue, which were communicated with the rapidity of lightning to other adjoining buildings.
Ozias now and then, as he talked, motioned Jerome, who put another stick of wood in the stove. The whole atmosphere, spiritual and physical, seemed to grow combustible, and as if at any moment a word or a thought might cause a leap into flame. A spirit of anarchy and revolution was caged in that little close room, bound to a shoemaker's bench by the chain of labor for bread.
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