65 



I will now pass on and describe to you briefly the manner in which 

 the low temperature, required in the incubators, is obtained. This cool- 

 ing is caused by a pickle-dUution, which, in its turn, is cooled in a 

 refrigerator (Figure 2) and is led through insulated pipes to four well 

 insulated incubators, after which it flows into special chambers of a 

 measurement of about three-tenths of a cubic metre placed within these 

 cupboards. By means of a tap the supply can be regulated. In addition 

 to this process there is also a formation of iceblocks, which are placed 

 nightly in special basins in the incubators, to retain an approximately 

 constant temperature during the hours of the night, during which time the 

 machine is at a stand-still and consequently does not produce cold. 



The cooling machine used at Wageningen consists of two absolutely 

 closed bronzed spheres, connected by a hollow steel shaft, which shaft is 

 resting on two bearings and is provided with a driving puJJey. By 

 revolving this machine, cold or ice can be immediately obtained. By this 

 means a chemical process is set up within the spheres, of which one 

 attracts warmth from its surroundings (the brine) and thus causes the 

 desired cooling, while the other one imparts the attracted wannth to the 

 supplied cooling water, which flows from the main tap. 



X 23301 G 



