Wright, Mark R., 1854- · London : Longmans · leaf 53
plate, and light it. Surroundthe candle with water, and place a lamp-glass over the candle ; 44 Heat although the glass is open at the top the flame is soon extinguished.Repeat the experiment, but introduce in the middle of the glass a cardboard diaphragmA A B ; the candle con-tinues to burn. Hold… … 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.
Physics
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