aca 



ATnAtifeofVODlES. Chap. 



Thedo&tine 

 touching the 

 atiradionof 

 fy- 



And therefore Galileo was much miftaken, when he thought to 

 make an inftrument whereby to difcover the limits of this force. 

 We may then conclude, that the breaking of the water mult 

 depend from the fhengch of other caufes. As for example,when 

 the gravity is fo great by increafing the bulk of the water, that 

 it will either overcome the ftrength of the pipe,, or elte make the 

 fucker of the pump rather yield way to aire, then draw up fo 

 great a weight : for which defects, if remedies be found, the arc 

 may furely be inlarged without end. 



This is particular in a fyphon; that when, that arm of it which 

 hageth out of the water is lower then the fuperficies of the wa- 

 ter; then, it will run of it felf;after it is once fet on running by 

 fucking. The reafon whereof is, becaufe the weight which is in 

 the water pendant, is greater then the weight of the afcending 

 water ; and thereby fupplyeth the want of a continuall fucker. 

 But if the nofe of that arm that hangeth out of the water, be buc 

 even with the water ; then the water will ftand ftill in both 

 pipes, or arms of the fyphon, after they are filled with fucking. 

 But if by the running out of the water, the outward pipe do 

 grow fhorter then te reach as low as the fuperficies of the water 

 in the fountain from whence it runneth ; in this caie, the water 

 in each arm of the fyphon, will runne back into the fountain. 



Withall, it is to be noted, that though the arm which is out 

 f the water be never Co long, yet if it reach not lower then the 

 foperficics of the fountain ; the overquantity and weight of the 

 water there, more then in the other arm, hclpethit nothing to 

 make it runne out. Which is, becaufe the declivity of the other 

 arm ovcrrecompenceth this overweight. Not that the weight in 

 the (hortcr pipe hath fb much force as the weight in the longer 

 piperbut becaufc it hath more force then the greater weight doth 

 exerciie therein its runningjfbr the grcateft part ofit force,tcnd- 

 erh another way then to the end of the pipe ; to wit, per- 

 pendicularly towards the center. And fo is hindered from effect, 

 by the great floping or little declivity of the pipe upon which 

 itlcaneth. 



But fbmc confidering how the vvatcr that is in the longer arm 

 of the fyphon is more in quantity then the water that is in the 

 t>rorc water to ot h- r arm o f j t vvhcreat it runneth our, do admire why the 

 greater quantity of water doth notdrarv back the kfle into the 



ciftcrn, 



Tkat the fy- 



