3.4 Callendar and Barnes’ Steady Flow Method
The apparatus that Callendar and Barnes used is shown in the Fig. 3.5.
Fig. 3.5 Callendar and Barnes’ apparatus of determining J
AB is a glass tube whose middle portion is very narrow. Through this narrow portion, a special platinum wire is passed which is fixed to two copper tubes of negligible resistance at its two ends. These copper tubes surround two platinum resistance thermometers, T. Due to the good conductivity of copper, the platinum resistance thermometers assume the temperature of the adjacent water very easily. These copper tubes have low resistance which prevents the generation ...
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