Perpetual Motion 



87 



Fig VI. — PicciOTTi's Patent, No. 1413, 1859. 

 Hydraulic Engine. 



conditions are reversed as to pressure, the curved tubes tend to 

 straighten and the straight tubes to curve, thus moving the lever 

 shown and givingopportunityto cause rotation by proper mechanism. 

 Of course, says the inventor, the tubes remain still of the same 

 length and diameter and have the same cubic content, so that no 

 water ever leaves the vertical pipe, the only thing occurring being 

 an alternation of pressure. 



15. A syphon mill, dated 1607, from an Italian print. Many 

 inventors have thought that by making the descending leg of a 

 syphon much larger in diameter than the ascending syphon, action 

 can be had even with a shorter descent than ascent, and hence 



