J4S ANALYSIS OF THE HYDRAULIC ENGIN2, 



Short enumfira- 1. That the water (of whick part is intended to be railed 



tionofitsprin- :i b ovc the level) muit have a fall. 2. That this fall affords 



ciplcs and mode * 



of operation. the ufual difference between the legs of the fyphon. 3. That 



if the fyphon had two or more alcending legs, water would 

 rife through them all. 4. That if one of thefe legs were (mall 

 and contained air, that air would pafs into the great fyphon, 

 and if the velocity of the ijuid were rapid enough, the bubbles 

 would pals down along with the water, inflead of rifing to 

 the top and breaking the column. 5. That if there were a 

 contrivance of two cocks in the water way of the fmall amend- 

 ing leg, and both were {hut, the portion of water might be 

 drawn out from between them by a fide cock, and that fpace 

 filled with air. 6. That this fpace may, if thought fit, be a 

 globe or other veflel. 7. That this fpace being above the 

 level, the water thus drawn off is in f aft raiftd. 8. That by 

 ihutting the fide cock, and opening the two others, the. in- 

 cluded air would afcend and be carried down the great fyphon. 

 9. After which another like portion of vyater might be drawn 

 out as before, &c. &c. And, 10. It is clear that by final! 

 fyphon work the cocks might be opened aud fhut without at- 

 tendance. 

 The water i« . This is only one of the many methods of railing water 



"' klfalf 11 * 1 above its Ievel h y virtue oi its faI1, lt certainI y polIeHes merit 

 and originality of invention ; but whether it be generally pre- 



Utility of pub- ferabie to other known methods is another queftion. For my 

 part, I think it is of advantage to our general jftoek of know- 

 ledge and invention, to publifh all ingenious novelties, with- 

 out any particular folicitude refpecting the extent of their 

 power. A variety of circumftances and local fituations af- 

 ford opportunities of applying engines, or their parts, with 

 lingular advantage, which in the general contemplation ef 

 their ftructure and ufe, might ieem to be more ftriking for 

 their lingularity thaa their effect. 



mentions. 



XIV. Simple 



