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121.

it as if it was 1 foot large to ye height of 100 foot: and a cylindric foot of water weighs 55 pound wch multiplied by 100 give 5500, 45 times 120 makes 5400, and by consequence ye sumn is full enough, and if ye sodder had been good thrô out ye vessel had carryed 100 pound or 2 foot of water more, we must consider that we do not make ye weight distributed thrô out; if we would know ye proportion of ye resistance of other pipes, we may follow these rules, supposing the plates to be strong enough.

      Rule I

  If ye height of ye reservatory is double, there will be ye weight of twice as much water and by consequence ye metal must be twice as thick in ye pipe, that there may be twice as many parts to be seperated.  If ye diameter of ye pipe is twice as large it must be twice as thick: for so ye same parts of the Tinn shall be no more charged being made double.

      Rule II

  If ye plates are less strong, and ye rupture ought to be made in these supposing of cast iron or of some other rough and [[?cafsant]] matter, when  ye pipes have 4 times as much height we must only double ye thickness of ye metal as hath been proved above:  for then ye plate is broke as ye lever, and the conter-lever becomes twice as great and there is twice as many parts to seperate, ye same thing will arrive if ye diameter is double:  for it will have 4 times as much weight;  we must therefore only double ye thickness:  whence these different plates may support ye same weight, but ye weight being quadruple we must double ye thickness and if ye height and ye largeness of ye pipe are greater we must calculate as in ye example above;  we must double ye thickness for ye quadruple height, and double that for ye quadruple surface of ye base therefore we must quadruple ye thickness of ye plate, but when it is tinn or of copper very flexible if ye reservatory is 4 times as heigh, it will have 4 times as thick, and if ye diameter is double it will have yet 4 times more weight, and we must again quadruple ye thickness, wch shall make it 16 times as thick:  So if 1/12 line thick of copper can support a pipe of 60 foot heigh and 4 inches large, if ye height is 240 foot, and ye largeness [[strikethrough]] inch [[/strikethrough]] 8 inches, there must be 8 lines of copper.

  It seems better to make ye pipes a little thicker than according to this calculation for it happens sometimes that there is faults in ye matter.  We have seen conduits of cast of 4 inches diameter and of 3 lines thickness where wee found many pipes of those wch were joyned together to compose ye conduit wch were broke, because in spouting they were emptied and the matter was defective in those places ye water also was seen to sweat through ye pores at ye beginning, but at last ye pores were stopped by ye filth of ye water carried, and were afterwards of good service.

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        DISCOURS III
   The distribution of waters

  To part ye water into divers spouts and to know how to give to each wch may serve also for ye distribution of ye water of a source into many particulars, we must have a gage whose holes are square and not round.

[[image: Drawing of three parallel lines A B, C D. E N. Vertical lines down from E N are E H, R S, F P, L T, M V, G O, X Y, I Q, and K Z.]] 
 
  We must place ye square holes about two lines below ye surface C D in a straight horizontal line E N:  Now if we divide this gage into many squares sensibly of an inch as E F P H &c they will give more than an inch:  for if the 

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mandc: Reviewed and amended image description. Image: http://echo.mpiwg-berlin.mpg.de/ECHOdocuView?url=%2Fpermanent%2Flibrary%2FQERNH1MN%2Fpageimg&start=11&mode=imagepath&pn=336&ww=0.2627&wh=0.0872&wx=0.7363&wy=0.387