FROM THE PRACTICAL VIEWPOINT 



as for the tanks. Discharge pipes constructed with 

 these insulating jackets are now provided for ma- 

 chines which are placed upon the market at the 

 present time. 



A modification of this type of holder is now be- 

 ing manufactured in which the holding tanks do 

 not revolve but are made stationary and, instead, the 

 central valve revolves. The same effect is secured 

 as in the other type, and there is this advantage, 

 that less power is required, and the heavy frame 

 required to hold the revolving tanks is not neces- 

 sary. There is also this added advantage, namely, 

 that a small plant may install such an apparatus 

 with but two or four tanks, and as business ex- 

 pands there may be added other tanks, it being 

 only necessary to change the shell of the valve 

 which revolves about the core. 



In Fig. 23 there are seven oblong enamel-lined 

 tanks which are immersed in a tank of hot water. 

 These are each filled in turn by me'ans of valves 

 in a pipe which extends along the upper side of 

 the series. These valves are opened and closed 

 by means of an automatic arrangement operated 

 by a revolving shaft extending parallel to the inlet 

 pipe. A similar shaft extends along the discharge 

 105 



