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PLATE 



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Is a fedion of a machine fimllar to Hrero's fountain, but deilgned to raife water to a great 

 perpendicular height, where there is the convenience of a fmall fall. 



a b the ftream of water, h c c the height of the fall of it, fuppofe ten feet, de two vef- 

 fels of lead or iron containing, fuppofe, four gallons each,/^ hikl are veffels of lead con- 

 taining, fuppofe, two quarts each, op two cocks, each of which paffes through two pipes, 

 opening one and clofnig the other, ^ r a water balance moving on its centre s and turning 

 the two cocks and />, alternately, tuTca^wx two air-pipes of lead one quarter or half 

 an inch diameter within, y %, y z, y z, water-pipes one inch diameter. 



The pipe beck always full from the ftream a b, the fmall clfterns g i I, and the large 

 one d, are fuppofed to have been previoufly full of water, then admit water by turning 

 the cock through the pipe c e into the large ciflern e. This water will prefs the air, 

 which was in this ciftern e up the air-pipe w x, and will force the water from the fmall 

 cifterns ^i / into the cifterns b k and great C. At the fame time by opening B, the water 

 and condenfed air, which previoufly exifted in the large ciflern d, and the fmall ones/>6 k, 

 is dlfchargcd at B. After a time the water balance q r s clofes the cocks now open, and 

 opens their^antagonifts, and the cifterns //; k are emptied in their turn by the force of 

 the condenfed air from the ciftern d, as the water enters into it from the pipe b c. 



