Viewing page 110 of 140

This transcription has been completed. Contact us with corrections.

106.

persons wch have made experioments is small pipes as F G, and they have concluded as well as ye  [[strikethrough]] water grew heigher [[/strikethrough]] greatest part of ye makers of fountains that ye water goeth heigher thro^ small straight passages than thro^ large, wch is contrary to reason and experiment except when ye conduit is very strait:

  The same thing happens when ye passages are long of 6 or 7 inches, or of 2 or 3.  for ye spout shall be heigher thro^ a simple hole in ye plate wch shall be of a line or half a line thick: we may easily experiment if if we shall have a pipe of 6 or 7 inches large as A B C D, and that in ye pipe E F sufficiently large, there may be made two equal holes in E and H,

[[image: drawing of an "L-shaped tube A B C D F E, with a spout G I, and a hole H on the top side of the base of the L.]]

the first having a passage G I and ye other but ye thickness of the metal: for we shall see ye spout thrô H will go heigher that thrô G I, and ye more we diminish in height of G I, ye more its spout will approach to that of H: whence it follows that ye long passages wch are put at ye mouths of dolphins in fountains are very defective [[strikethrough]] ?and ?at ye passage shall be  ? ? ?[[/strikethrough]] and althô ye passage should go a little conical, ye spout would nevertheless be retarded here is an experiment:  a pipe of glass of a foot heigh and of an inch large having its hole of 2 1/2 lines leaped to 10 1/2 inches when it was conical but being made without a cone, it leaped to 11 inches.
    
  To regulate ye largeness of pipes of ye conduit of water according to height, of ye reservatorys, and ye greatness of ye passages, I made ye following observations.

  There is at Chantilly a conduit of a pipe made with pieces of oak wood pierced ye holes are of 5 inches diameter. ye height of ye water in ye reservatory is 18 foot, and ye conduit sloping to an horizontal channel is near 104 toise ye channel being let dry we pierced one of ye bodys above and placed there a passage of 10 lines ye water being retained below, ye spout went to 15 foot, so that there was some small hindrance in ye long conduit and in ye passage: for

Transcription Notes:
mandc: Reviewed. "Toise" = six feet or a fathom. Desaguliers' diagram: http://echo.mpiwg-berlin.mpg.de/ECHOdocuView?url=/permanent/library/QERNH1MN/pageimg&viewMode=images&mode=imagepath&pn=283&ww=0.1417&wh=0.2607&wx=0.7227&wy=0.4339