41 



usual stirrer in the inner 

 vessel there is a cylinder B 

 on the side and bottom of 

 which are fixed wings or 

 dashers F on the outside 

 reaching close to the vessel 

 and thus compels the milk 

 which enters at the bottom 

 from G to spread itself in 

 a thin layer over the heat- 

 ing surface until it reaches 

 the top after reaching the 

 desired temperature. It 

 then goes over the rim of 

 B and is forced downwards 

 by the fixed cylinder C, 

 which is attached to the 

 Fig. si. close cover and reaches 



close to the bottom of the revolving cylinder B. The milk 

 then rises in the inner cylinder C and leaves the apparatus 

 at H, as indicated by the arrows. The smallest heats 2,800 

 ft>s. per hour from 86 to 215 Fah, and the price is about 

 $188. The largest heats 10,800 Ibs., and costs |390 f. o. b. 

 Bergedorf. Mr. Jos. Siedel reports favorably on this heater. 



REGULATORS FOR HEATERS. 



In working with continuous heaters the great problem is 

 to be absolutely sure that all the milk that leaves the heater 

 is of the desired temperature. Even if a man watches the 

 thermometer pretty carefully he may miss it now and then. 

 Hence the Royal Danish Experiment Station took up the 

 work and Messrs. V. Henriques and Stribolt constructed the 

 regulator shown in Fig. 32. 



It consists of a box attached to the side of the heater. In 

 this is a spring constructed of two bars, the inner of steel and 

 the .outer of brass, riveted or soldered together. One branch 

 is fixed firmly to the side of the box, while the other is left 

 free to move. As the brass bar expands more than the steel, 

 but is firmly attached to it, the result is a lateral movement 

 and this is utilized to shut off the valve on the milk supply 



