ng box. Experiment 49. — Fill a large test tube with water. Sprinkle in thewater a little fine sawdust. Hold one side of the bottom of the tube inthe flame of a lamp or Bunsen burner. Note the circulation of the water. Experiment 50. — Light a lamp and.hold the hand at a given distance uponevery… … Fig. 46. Experiment 51. — Bore holes in acigar box at A and B, as in Fig. 46,Place a lighted candle at A, then covereach hole with a lamp chimney. Hold a smoking paper at C and notethe result. This shows how coal mines and the like are ventilated. Convection. — The air around any source of heat,…
Physics
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