Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
ch. The diagram represents a section of a gas-jet flame. The burning-of other substances, as tallow, liquid oils, etc., involve the same prin-ciples ; for these must be, and are, converted into gas before they areburned. The gas-jet or candle-flame is not a solid mass of fire, but a hollowshell of… … 192 HEAT AND STEAM-ENGINE. lighter than the air, and tend to rise, which, with the heat of combus-tion, produce an upward current, causing the flame to ascend, andgiving it a conical or pointed form. The air being composed of 1 part of oxygen to 4 of nitrogen (134),affords just enough free oxygen…
Physics · Astronomy
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