METHODS AND APPARATUS. 



19 



thermometers, A or B, fig. 3, were used, these being held in place by a bandage; 

 afterwards they were pressed somewhat into the flesh by placing them under 

 small pieces of wood which were strapped in position. A later type is shown 

 in D, fig. 3. Here the general shape of the thermometer is along the lines 

 finally used by Gamgee. 1 The support consists of a cork disk, somewhat 

 rounded on the face. To this is shellacked a piece of thin sheet copper, shaped 



- ig. 4. Details of constant-temperature bath. The tube A, mounted in the block B, and inserted 

 in a bath of warm water in the Dewar flask D, serves as a support for the thermal-junction 

 wires C. The mercury thermometer E is inserted to the depth of the thermal-junctions. 

 The water in the flask is stirred by compressed air entering through the tube F. 



so as to bulge outward from the support. This copper plate furnishes one of 

 the metals of the thermo-couple, a constantan wire soldered to the center of 

 the back supplying the other, and a copper wire, also soldered to the plate, 

 completing the circuit. The base is made of cork in order to give the apparatus 

 a smaller mass, and the copper is shaped in the manner described so that it may 



'Gamgee, loc. cit. 



