Comprises of two similar units of double wall, joint-less, brass N.P. vessels  with a bakelite cover are joined  together by two brass T tubes, which enables water to circulate between the annular space of the copper vessels. The copper vessels are fitted with  bakelite  cover in which spun calorimeters 75x50mm size are suspended. A second covering protects the top of the calorimeter from dust and heat losses . Complete with stirrer and corks but without thermometers. For determination of  the specific heat of liquid (Glycerine) by the method of cooling.