142 



A RESPIRATION CALORIMETER. 



designation T No. 3 is placed, represents the outline of the key, which, 

 when pressed, will connect the two wires leading from the upper section 

 of the thermal junction system in the inner wooden wall with the two 

 wires leading to the galvanometer. 



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Kio. 43. Diagram of Electrical Connections of Mercury Switch. The upper portion of diagram 

 represents the thermometers and junctions and the galvanometer with which the bridge is 

 connected. 



The four sections of this thermal junction system are connected with 

 the four upper keys of the switch. The four sections of the inner 

 thermal junction system, z. e. , No. i, are connected with the four keys 

 immediately beneath those for system No. 3. In order that the alge- 

 braic sum of the electro-motive forces for the four parts of system 



