54? APPARATUS FOR RAISING WATER. 



Defcriptlon of ciftern. An equilibrium being foon eftabliftied between the 

 co^fouftedVor a ^ m g c °lumn in the well, and the re-afting one included in 

 raiting water, the pipe K K and the chambers F, H, by the expulfion of 



by air condenfed th(J a ; f ffom g ( , ie water wil , a f tervvarc J s a f ce nd much flower 

 in an inverted . ,, . ,. ~. rin-ii- 



iyphon. into H than at firft, an equal depreffion of the fluid being 



produced in the pipe C and the chamber F, by the collecting 



of the condenfed air. 



In more or lefs time, according to the capacities of the 

 chambers, fo much water will be expelled from the lower as 

 will fill the higher, the air having been expelled from this laft, 

 through the pipe G, whofe outlet is at O in the cock C EG O, 

 Fig. 3. Water will then begin to afcend into that part of the 

 pipe G which rifes from the top of the velTel, and the acling 

 column being lengthened in proportion to the increafing height 

 of that which it counterpoifes, the condenfed air will deprefs 

 the water in the veflel B below the float, which defcending, 

 will lower the re-curved fyphon, and water will fall into the 

 elevated bucket M, which foon afterwards in confequence of 

 its load will defcend, and by moving the cock above, will 

 open a communication between the pipes C and G, and be- 

 tween the infide of the chamber F and the external air, when 

 the condenfed air will ruth out, and this vefiel refill with water 

 from the cittern. 



The force of the acting column being now thrown upon the 

 contents of the higher chamber H, the valve in the pipe K 

 will clofe, and water will afcend through the pipe L, into 

 the ciftern appropriated for its reception. 



At the firft opening of the communication between B and 

 H, the re-curved fyphon S will pour water into the bucket 

 laft elevated ; but before the load is fufficient to move the ap- 

 paratus, the fyphon, if properly adapted to its purpofe, will 

 be drawn up again, in confequence of the condenfed air being 

 expelled fafter from the vefTel B, than it defcends by the pipe 

 A A : for the water will always rife with the greateft rapidity 

 after the turning of the cock, becaufe of the difference fub- 

 fifting between the acting and re-a&ing columns, and the air 

 previoufly flored up in the vefiel B. The fupply of condenfed 

 air, however, being inadequate to fupport the difference, an 

 equilibrium foon takes place, by the water afcending into the 

 loweft part of the pipe C. 



The 



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