. Physical laboratory experiments : mechanics, optics and heat. n may be readilyobtained. To determine the correction experimentally a directcomparison of the mercury and hydrogen thermometer wouldbe necessary. The amount of this correction for various kinds of glass isgiven in the following table, taken from Guillaumes Ther-mometrie:— MERCURIAL THERMOMETRY 25 Algebraic Excess of Reading on Scale Specified ovek that of the Hydro-gen Thermometer. Scale. 10° 20° 30° 40° 60° 60° 70° 80° 90° Nitrogen . . + + + + + + + — Verre dur . + + +
. Physical laboratory experiments : mechanics, optics and heat. n may be readilyobtained. To determine the correction experimentally a directcomparison of the mercury and hydrogen thermometer wouldbe necessary. The amount of this correction for various kinds of glass isgiven in the following table, taken from Guillaumes Ther-mometrie:— MERCURIAL THERMOMETRY 25 Algebraic Excess of Reading on Scale Specified ovek that of the Hydro-gen Thermometer. Scale. 10° 20° 30° 40° 60° 60° 70° 80° 90° Nitrogen . . + + + + + + + — Verre dur . + + + + + + + + + Freuch crystal (hard) . . + + + + + + + + + French crystal (ordinary). + + + + + + + + Jena glass lem + + + + + + + + + Jena glass 59in + + + + + + + + — English crystal (Wiebe). . + + — Fiff. 4. Object.—The object of thefollowing experiment is togive practice in the propermethod to follow in exactmercurial thermometry. Theproce(iure is illustrated bythe determination of theboiling point of some liquid. Apparatus.— The studentis to use the thermometerwhich he has apparatus required isshown in figure 4. A is asmall boiling flask providedwith a side tube B, whichis connected with a returncondenser C, The flask isclamped in position on anasbestos and wire gauze sup-port, so constructed that thedirect flame does not comein contact with the thermometer is held inJ place by a cork fitting theneck of the flask; the bulb 26 NOTES OF PHYSICAL LABORATORY EXPERIMENTS should be wholly immersed in the liquid or in the vapor accord-ing as the boilmg point of the former or temperature of thelatter is to be determined. The addition of glass beads, garnets,or scraps of platinum, to the flask is frequent
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Keywords: ., bookcentury1900, bookde, booksubjectmechanics, booksubjectphysics
