454 ?ke Jucking [Book V.II, 



cut off by the prefiure of the, air at b, downwards, 

 would be more than equivalent to eight thoufand 

 feet of air. The column of air, therefore, which 

 prerTes at b, will be too flrong for more than eight 

 thoufand feet ; thus the twenty- two feet of water re- 

 maining above will not be in equilibrium with the 

 column of air till after it has rifen higher than eight 

 thoufand feet. 



In order to have a fecond portion of water with a, 

 pump of this conftruftion, it is in the firft place ne- 

 ceffary to (lop the aperture which war. made at b> then 

 to give feveral ftrokes with the pifton to elevate the 

 water as high as c\ and laitly, to open again the 

 orifice at b. Obferve the fimplicity of this procefs 

 for raifing fo fmall a quantity of water ! for it is necef- 

 fary that the afpiration pipe fhould be of a very fmall 

 diameter, otherwife the column of water would break, 

 and the air would pafs through, and not one drop of 

 water could be raifed into the body of the pump. 

 This fad -(adds M. BruTon) may ferve to convince 

 thofe who are fond of novelty, that before an opinion 

 generally received is pronounced to be falfe, it is. 

 neceffary to think twice at the leaft. A fhort time 

 after the conftructing |of this pump at Seville, M. 

 Bellange, a goldfmith in Paris, made one in imitation 

 of it, to which he gave the additional property of 

 throwing water fifty-five feet high, by means of a 

 continued jet or ejecting pipe, though the machine was 

 only a fimple fucking pump. 



To a fmall bodied pump of two inches and one- 

 twelfth in the interior diameter, the pifton of which 

 had eight inches play, he adapted an afpiration pipe 

 of ten-twelfths of an inch diameter, and fifty-fix feet 

 long; this pipe was furnifhed wkh a fucker at its junc- 

 tion with the body of the pump, and with another at 



its 



