432 



SUPPLEMENT. 



Let A be a large, strong, close vessel ; immersed it 

 water up to the cock b, 

 and having a hole in the 

 bottom, with a valve a 

 upon it, opening upward 

 within the vessel. A pipe 

 B C rises from the bottom 

 of this vessel, and has a 

 cock c in it near the top, 

 which is small there, for 

 playing a very high jet d. 

 E is the little boiler (not 

 so big as a common tea- 

 kettle) which is connected 

 with the vessel A by the 

 steam-pipe F ; and G is a 

 funnel, through which a 

 little water must be occa- 

 sionally poured into the 

 boiler, to yield a proper 

 quantity of steam. And 



a small quantity of water will do for that purpose, 

 because steam possesses upwards of 14,000 times as 

 much space or bulk as the water does from which it 

 proceeds. 1 " 



The vessel A being immersed in water up to the 

 cock b, open that cock, and the water will rush in, 

 through the bottom of the vessel at a, and fill it as high 

 up as the water stands on its outside ; and the water, 

 coming into the vessel, will drive the air out of it (as 

 high as the water rises within it) through the cock b. 

 When the water has done rushing into the vessel, shut 



Note 132. Under ordinary circumstances, the bulk of a given quan- 

 tity of \valer converted into steam, is not expanded more than two 

 thousand times ; but, by encreasing the supply of caloric, the elastic 

 particles may be made to occupy a space infinitely greater. 



