Copper continued description

The Copper Calorimeter.—The first description of this apparatus was given by W. Nemst, F. Koref, and F. A. Lin-demann (36) detailed instructions for its use were given later by Koref (60), who has carried out a large number of valuable measurements with it. The work was then continued by A. S. Russell (79a) and Ewald (99) the latter, in the examination of ammonium compounds, discovered the remarkable fact that there is here a transient decrease of specific heat with rise of temperature over a certain range, which points to internal rearrangements in the ammonium radicle. 

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