458 TPIE CENTURY, 



diagram, it is obvious that water placed in A, will 

 flow onward to B, and stand at the same level in both 

 cisterns. The valve in each globe requires to be so 

 arranged, that when forced open its spring will prevent 

 its closing until acted on by a weight, which weight 

 must hang to the inside of the valve by means of a 

 chain, and be able to float on the surface of the water, 

 and it will be requisite to adjust the chain to such a 

 length that when the water is at a certain level it shall 

 have no influence on the float-weight of the valve, 

 which will then close. 



With this apparatus, the operator can conceal the 

 connection between the two cisterns, and that between 

 the bottoms to admit steam. The water is now seen 

 at the same level in u two vessels,&quot; and with a perfo 

 rated shelf about an inch below the surface of each. 

 We may now find, &quot; if a globe be cast in,&quot; the water 

 &quot;instead of rising, it presently ebbeth, and so re- 

 maineth,&quot; doing nothing further &quot; until a like globe 

 be cast into the other vessel ; which the water is no 

 sooner sensible of, but that vessel presently ebbeth, and 

 the other floweth.&quot; For it must be observed, the first 

 globe was placed in the centre, over a steam pipe, its 

 nozzle protected with a valve, and on letting in the 

 steam, being otherwise empty and the valve purposely 

 opened for the escape of steam and air, but which its 

 weight closed as soon as permitted to act, and thereon 

 condensation followed, the water flowed into that 

 vessel, but ebbed in the other. We then insert a 

 second globe, in the second cistern, under like condi 

 tions; and as soon as the rising water has opened 

 the top valve of the first globe, this second globe will 

 repeat the operation, &quot; and so continueth ebbing and 

 flowing until one or both the globes be taken out.&quot; 

 And this ebbing and flowing, this rising, and these 



