WITH NOTES. 549 



porate itself with the rising Water, and at the very 

 bottom of the same Aquaduct, though never so big 

 or high.&quot; 



We cannot do otherwise than consider that the articles, 

 Nos. 68, 98, and 100, refer to descriptions of the several 

 parts of his remarkable steam engine. In No. 68, we 

 have the two vessels, with two cocks, connected with a 

 furnace, and so arranged that &quot; one vessel of water 

 being consumed, another begins to force and refil with 

 cold water.&quot; In No. 98, we have intimation of &quot; the 

 primum mobile,&quot; forming the 3rd division of the par 

 ticulars enumerated above ; being some portion of the 

 engine capable of every variety of movement. And in 

 No. 100, we have no mechanical suggestions, but in their 

 place a bare enumeration of results, and of advantages 

 to be derived from the employment of such engines. 

 What then are we to understand by the preceding 

 list of particulars ? &quot;LA perfect counterpoise,&quot; would 

 suggest that the Marquis had contrived a complete system 

 of pumping; &quot;2. A perfect countervail&quot; appears to be 

 only a different kind of counterpoise, as though the one 

 were derived from weight, and the other from the action 

 of the steam ; 4. &quot; A vicegerent,&quot; may be the force or 

 piston ; 5. &quot;A helm or stern, with bit and reins,&quot; can 

 hardly be mistaken for any other than levers, acting 

 on valves, and in some positions connected with chains 

 running over guide pulleys ; while the parts 6, 7, and 

 8, refer wholly to reservoirs, cisterns, and other external 

 arrangements. But this statement is simply made to 

 remind the reader that the Marquis s Engine was not 

 so entirely simple in its construction as to consist only 

 of a boiler and receiver, and to depend wholly on the 

 effect of the direct action of steam on a large surface 

 of cold water, as generally intimated. It is usual 

 entirely to set aside this full and clear statement of 



