The First Steam-Boat

C 20 ) laid than barely that of the Height of-the Y lin'dabove them. To prove that the Water in thermal] Tube, in the VeffeJ laft mentioned prefieth againft the Bottom and Sides and Top of theVeflel according to itsl4 eight, we have the following Experiment. Take t-wo round Boards of about a foot Diameter, andjoin them together with Lea- ther, tn the manner of Bellows that they may hold Water, and in the Top-m of Board fcrew in a fnall Tube of a confiderable Length, as 4 Foot : Set a weight on the Toy of this Veffel near equal in Weight to a piHar of Water of ia IncbesDiameterand 4- Foot high, keep pouring Water into this Tube at tbeTop, anditwillraife theWeight, noiwithftanding the Water in theTube is not near fo heavy as the Weight on this Board a} Fig. 7. Or, if you were to fll this Veffe’l with Water and lay on more Weight than, the Weight of the largef Column u-p to the Top, this Weight -would driv the Water out at the Top of the fmall Tube-. Foras in 'Mechanical Inftmments a heavy Body -will force a lighter, a larger fpace and a. light Body by faffing a larger Space, will rape a neavy Body, a fmallSpace*, there- fore Weights are to their Spaces in an Jn- -verfe.