8/2 



THE HOMEOSTAT 



Figure 8/2/1 : The Homeostat. Each unit carries on top a magnet and 

 coil such as that shown in Figure 8/2/2. Of the controls on the front 

 panel, those of the upper row control the potentiometers, those of the 

 middle row the commutators, and those of the lower row the switches S 

 of Figure 8/2/3. 



Figure 8/2/2 : Typical magnet (just visible), coil, pivot, vane, and water 

 potentiometer with electrodes at each end. The coil is quadruple, con- 

 sisting of A, B, C and D of Figure 8/2/3. 



101 



