Mechanics and heat; an elementary course of applied physics

by John Duncan

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. ...it does not necessarily follow that the thermometer is in error. It will be remembered. (p. 180) that the water must be boiling under standard atmospheric pressure, and this may not be the pressure of the atmosphere at the time the test is carried out. To obtain the pressure of the atmosphere, readings of a standard barometer should be taken while the experiment is going on, and the temperature at which water boils when subjected to this pressure will then be found from the Table, p. 367. The error may be stated approximately as the difference between the observed boiling temperature and that shown in,,, the Table, and should be noted with its Flo. 205.--Apparatus for.' comparing the scale of a proper sign attached, + or--. a standard thermometer." Should the bore of the stem of a thermometer not be uniform, equal increases of volume of the mercury will not be indicated by equal differences in the level of the mercury column. The bore, of course, ought to be as uniform as possible, and this is tested in ordinary physical work by careful measurement, and any inequalities found allowed for. For our purpose, the following simple experiment will suffice for testing the accuracy of the graduations between the freezing and boiling points. Expt. 41.--In Fig. 205, B, B, are two thermometers, one of which is a standard thermometer, i.e. one in which the graduation errors are known, and the other is a thermometer to be tested. Both are suspended with their bulbs immersed in water contained in a beaker A. Gradually raise the temperature of the water, and take simultaneous readings of the thermometers at intervals of say 5, being careful to stir the water well before taking the readings. Note these readings Columns 1 and 3 are filled in from the...

96 pages, Paperback

Published July 4, 2012

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John Duncan ( -1941)