H YDR OSTA TICS. 



119 



piston as the area of the larger piston is times greater than 

 the area of the smaller one. If, for example, the smaller 

 piston have an area of 1 sq. cm. and 

 the larger piston an area of 16 sq. 

 cm., a weight of 1 Kg. may he made 

 to support a weight of 1C Kg. 



221. Pascal's Experiment. 

 Pascal firmly fixed a very narrow 

 tuhe about 30 ft. high into the head 

 of a stout cask. He then filled the 

 cask and tube with water. The 

 weight of the small amount of 

 water in the tube, producing a pres- 

 sure as many times greater than 

 itself as the inner surface of the 

 cask was times greater than the 

 sectional area of the tube, actually 

 ^^^^^^ burst the cask. 



FIG. 68. 222. The Hydro- 



static Bellows. The hydrostatic bellows 

 consists of two boards fastened together by 

 a broad band of stout leather, and a small 

 vertical tube communicating with the in- 

 terior. If the tube have a sectional area of 1 

 sq. cm., the downward pressure at 5, its base, 

 will be one gram ibr every 

 centimeter of depth of water 

 in the tube. If the upper 

 board, B, have a surface of 

 1000 sq. cm. exposed to the 

 water in the bellows, it will 

 be pressed upward with a FIG. 69. 



