Wright, Mark R., 1854- · London : Longmans · leaf 53
Fig. 31. Some mines are ventilated on this principle; at the bottom ofone shaft c (fig. 32) a fire is kindled, this causes an up draught,and pure air rushes down the other shaft a to talce its place.This is a dangerous method if the gas in the mine be explosive. … Fig. 32. Convection of air is the cause of winds. Conduction.—If one end of a poker be put in the fire, theother end soon becomes heated. The heat travels along theiron, from particle to particle. Transference of heat in thismanner is called conduction. The end of a short poker soonbecomes so hot…
Physics
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