The Motion of Fluids, Natural and Artificial

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: On the Attraction of Cohefiori. IF the Bore of a Pipe be even ah eighth of an Inch in Diameter, the Attraction fpoken of will be very apparent: For on immerfing the End in fome Fluid, and taking it out again, a great Part indeed will quit the Tube; but fome will ftill remain, and hang therein. And if we take feveral final! Glafs Tubes different in Size, arid immerfe them together in Liquors, thofe of the finalleft Bore will attract the Fluid moft, and it will be found therefore always to ftand the higheft in them, The fame Caufe which inclines Fluids to rife in fmall Tubes above the Level of the reft, which they very notably do, makes them afcend alfa in the Filaments or Threads of Cloth, in the way of Filtration; which fooner takes effect if the Pores of the Cloth be firft filled with Liquor. The Cells of Bread, Sugar, and other porous Subftances, for a like Reafon imbibe Fluids plentifully; in which they rife, againft the Direction of Gravity, for the Reafon juft affigned. This Attraction will be very notable in an Experiment upon a Crane or Syphon of a fmall Bore. If one of the Legs of this Machine be immers'd in a Jar of Water, the Fluid, as in fmall Tubes it does, will rife therein, and fen- fibly ftand fomething above the common Level of the reft: And if the Jar be filled quite to the Brim, the Difference fpoken of will take place in the Bend of the Syphon; which when it fhall have paft ever fo little, (and if the Tube be firft wetted within, this will foon happen) Gravity will then lay hold, and pufhing out the Air before it, bring it down; after which the Water will continue to rife through the Bore of the Machine, like a continued Thread, till it mall have emptied the Veffel to the Depth of the immers'd Leg; the Reafon whereof comes next to be enquired int...