. Laboratory lessons in general science . ined? Fill with mercury a glass tube that is at least thirtyinches long and closed at one end. Holding the forefingerover the open end, invert the tubeand put this open end down undermercury in a dish (a small mortar).Cautiously remove the finger, and ob-serve the upper end of the mercurycolumn. Explain why the mercurycolumn stands in the tube above themercury level in the dish. Tip thetube back and forth sidewise for shortdistances, being careful to keep thelower end at all times below the sur-face of the mercury in the dish. Whatseems to be true
. Laboratory lessons in general science . ined? Fill with mercury a glass tube that is at least thirtyinches long and closed at one end. Holding the forefingerover the open end, invert the tubeand put this open end down undermercury in a dish (a small mortar).Cautiously remove the finger, and ob-serve the upper end of the mercurycolumn. Explain why the mercurycolumn stands in the tube above themercury level in the dish. Tip thetube back and forth sidewise for shortdistances, being careful to keep thelower end at all times below the sur-face of the mercury in the dish. Whatseems to be true of the space abovethe mercury in the tube? Measure the distance vertically up-ward, both in inches and in centimeters, from the surfacelevel of the mercury in the dish to the level in the long will this height remain unchanged? What istrue of this difference in levels as the tube is again tippedsidewise? As mercury is times heavier than water, 1 The part of this experiment making use of mercury should be done bythe Fig. 21. — A simplebarometer. 56 LABORATORY LESSONS IN GENERAL SCIENCE calculate what height of water column would be supportedby the same atmospheric pressure. 5. If possible make a study of a mercury barometer, not-ing in it (a) the mercury cistern and how the air pressurefrom without reaches the mercury surface; (6) the heightsof the mercury column from time to time, and from whatpoint this measurement is taken in all cases; (c) the provisionfor reading the height of the mercury column to the fractionof an inch. What would be the effect of the presence of any air withinthe tube (a) upon a rising barometer column; (6) upon afalling column? APPLICATIONS OF ATMOSPHERIC PRESSURE 1. Tightly close the mouth of a tall bottle with a rubberstopper through which passes a pipette wThose small end isinside the bottle. Attach a short piece of rubber tubing tothe large end outside the bottle, and with the mouth byrepeated efforts exhaust the air from t
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