Hydraulics.

. Again : la the other Hemisphere FDR*E Attraction of the Moon conspires with^ of the Earth; but decreasing as theshares of the Distances increase, the Joint° rce of Attraction will every where de-Cse ase from F and B towards D, the Point^Pposite to the Moon; where, again, theater s will be lightest, and therefore standF§hest to preserve the Equilibrium. Whencea Ppears, that by this Sum and DifferenceMoon’s and Earth’s Attraction, there

\Yj]l

^ necessarily ensue a Protuberance or^Mling of the Waters, which we call^ 'if Flood , in the two Points A andErectly under the Moon. Also in thePoints F and B, as the Waters aremost attracted, so they will be^ a jiest, afK ] consequently rise to the leastei §ht from the Earth’s Surface, whence

they

Of ,

P^ lre in Englijh Measure was -,y A of an Inch,t i le Area of its transverse Section will be5 - S °Tk’ ° r ver Y nearly Act of an Inch Square.^'' rc Umf 6 ^‘ ameter °f the Æolipile is 4 Inches, its*b 0ut g ere nce therefore is 12,566 ; its Thickness^ 0r 0,08 of an Inch, whence 12,566 X 0,08

the Area of the rended Circumference ofiff, or° Then fay, by the Rule of Three, If

tssll j o rrs ' tequire 2991 or 300 Ib. to break it, What.for ^ 8tiare Inch require ? The Answer is, 38250 Ib.

A 1 : 38250 Ib.-- So the Force of theEnd , lc 1 burst the Æolipile was Tbirty-eigbt 1 'bou-hrid J)' A undred and fifty Pounds , or one Thou-

Tlf "^^ted and Twelve Tons and an half.ls tnay serve as a notable Instance of the incre-dible

93