87 



feet, and is consequently 3 feet in height. Itis formed 

 by two plates clinched to the body of the boiler and 

 traversed through its whole length by vertical tubes 

 of one inch and a half in diameter, which connect 

 the lower part of the boiler with the upper part and 

 serve to circulate the juice when boiling. The steam 

 produced escapes by the top and is condensed in the 

 chamber of the next boiler. The stearn in the chamber 

 circulates about these tubes, warms them and is 

 condensed. The steam for the first comes directly 

 either from the steam boilers, or the exhaust steam 

 from the engine. 



Each boiler is furnished with a steam gauge to 

 ascertain the pressure and regulate the quantity of 

 water to b,? used in the condenser, a thermometer 

 for the h'lij.piTfiture f the liquid, a steam gauge to 

 indicate Li.- inside pressure, a gauge to test the 

 syrups, a spirit level, and a glass to watch the 

 operation. 



Tho three boilers communicate with one another 

 by means of pipes, and on account of the difference 

 of the pressure, the syrups flow of themselves from 

 one boiler to the other. It may !. supposed that the 

 liquid passing successively through the three vessels 

 is more and more condensed arid arrives at the re- 

 quired state in the last. 



Boiling is pro iuced as follows : 



1st vessel temperature 20G 

 2nd u 185" 



3rd 4 - " 149" 



&et>yeeu fhe boilers there are safety 



