NORMAL PROCESSES OF ENERGY METABOLISM 569 



Berthelot (a} introduced the method of burning substances in oxygen 

 at high pressure, but because of the high cost of the apparatus it did not 

 come into general use for some years after it was described. The essential 

 parts of the original apparatus were a double-walled copper vessel filled 

 with water in which was immersed the vessel capable of holding the oxy- 



Tapper-' 



.'Motor 



thermometer > 



,. --Release 



Buiton 



Release Button 



Ignition Circuit- 

 Corrtac-ta 



Ignition Switch 



fuse Wire 



Ignition and 

 Resistance Coil 



Tapper Button-^ 



Motor Switch 



Fig. 23. The bomb calorimeter of Riche for use with Berthelot bomb. The Wein- 

 holdt cup which is placed inside the box and into which the pump is lowered is not 

 shown. 



Motor Circuit 

 Contnr.ts 



Rheostat for 

 Controlling Motor speed. 

 Spied should be 

 about 300 R P.M. 



(Tapper Circuit. 

 \Attachonc or 

 .(two dry cells 



m 



(16 Candle Power 

 ^ Carbon Filament 

 \Lamp 



{(Attachment Plug for 

 '\ Motor and Igniticn Circuit*. 

 i. D.C.orA.C. 



gen under high pressure together with the substance to be burned. This 

 vessel constructed of heavy steel nickeled on the outside and lined with 

 platinum became known as the Berthelot bomb, and whatever the modifica- 

 tion from the original pattern it is still known by the inventor's name. 

 The outer container filled with water is the calorimeter proper. A success- 

 ful modem construction is that of Riche shown in Fig. 23. It consists of a 



