Laboratory exercises to accompany Carhart and Chute's First principles of physics . r, if any. Weshall also test its zero graduation, which should mark thetemperature of water in the process of freezing, or of icein the process of melting. Experimental: Place the tabular form for observations near the top ofthe left-hand page. Record all readings as soon as made. (<0 Freezing Point. —Fill a funnel abouthalf full of cracked ice and support it in ajar (Fig- 68). Insert the thermometer insuch a way that the ice will be packed aroundthe bulb and nearly to the zero of the scale. After the mercur
Laboratory exercises to accompany Carhart and Chute's First principles of physics . r, if any. Weshall also test its zero graduation, which should mark thetemperature of water in the process of freezing, or of icein the process of melting. Experimental: Place the tabular form for observations near the top ofthe left-hand page. Record all readings as soon as made. (<0 Freezing Point. —Fill a funnel abouthalf full of cracked ice and support it in ajar (Fig- 68). Insert the thermometer insuch a way that the ice will be packed aroundthe bulb and nearly to the zero of the scale. After the mercury lias remained stationaryfor at least rive minutes, take the reading ofthe thermometer to tenths of a degree. Thedifference between this reading and the zeroof the scale is the freezing point error of theinstrument. No allowance need be made forthe atmospheric pressure. State the correction for your thermometeras — or +, according as the freezing pointwas indicated too high or too low. Thiscorrection should be added algebraically toall readings near the freezing point taken. Fig. 68. with this thermometer. FIXED POINTS OF A THERMOMETER 183 J rJ £l (5) Boiling Point. — To test the boiling point of thethermometer, see that the chimney is on the boiler and thethermometer adjusted so that the 100° mark is just abovethe stopper. The upper tube of the boiler should beopen; the lower one closed. The bulb of the thermometershould not dip into the water inthe boiler, which is half filledwith water. Boil the water untilthe reading of the thermometerremains stationary for at leasttwo minutes. Then take a read-ing of the thermometer, estimat-ing to tenths of a degree, andrecord. (<?) Next determine the effecton the boiling point when thepressure is increased. To theupper side tube attach the bentglass tube so that it points down-ward. When steam is escapingvigorously, immerse the long glass tube in a jar of water,so that its free end reaches nearly to the bottom of the jar(Fig.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysics, bookyear1913
