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<p>A detailed description is given of the construction of a calorimeter especially designed for the determination of the specific and latent heats of substances in general use as refrigerating media. The apparatus is adapted for use between - 50 degrees and 50 degrees C., and for pressures up to 70 atmos. in experiments where the measured heat added is used either to change the temperature of the contents or to evaporate a portion of the contents withdrawn as superheated vapour. The calorimeter is of the unstirred type, the heat being distributed through the contents by conduction, which process is facilitated by a system of radial metal vanes. The heating coil is located in the central axis of the cylindrical shell%
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<br>Subjects: apparatus and instruments; Heat flow, thermal and thermodynamic processes</div>
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