Of ‘Pneumatics Experiments. $87

use the former experiment: when this is set at the fire it grows hot, and being it hathno other vent, it will blow strongly from thence, but the blast will be moist andthick, and of an ill savour,. You may allomake

t/i vessel that fhattcajl forth water.

There is carried about with u? a Glass vessel, made Pyramidal, with a very narrowlong mouth , w ith which it casts water very far cff. That it may draw water, uukout the air with your mouth, as much as you can, and pretently thrust the mouth in-to the water, for it will draw the water into it, do lo until a th rd part of it be fil-led with water. When you will spout the water afarc ff, fill the vessel with air,blowing into it as hard as you can ; prelently take it from your mouth , aed inclinethe mouth of the vessel, that the water may run to the mouth, and stop the air;,and the air striving to break forth, will cast the water out a great way. Eutif youwill without attraction of Air, make water fly far with it, heat the bottom of thevessel a little: for the air being rarefied seek? for more place , and t riving to breakforth , drives the water before it Thus drunkards making a little hole in a vesselof wine, because the wine will not run out, the mouth bein f stopt, whereby the airmight enter, they will blow hard into that hole; then as they leave ess, the winewiil come forth in as great quantity, as the air blowed in was. Now 1 will shew

How to make water ascend conveniently.

We can make water rise to the top of a Tower: Let there be a leaden Pipe that maycome from the bottom tothe top of the Tower , and go down again from the top tothe bottr m, az a Conduit - let one end it and in the water that we desire should rife,the other end that must be longer and hang down lower, must be fastned into a ves-sel of wood or earth that it may take no air ac ail: let it have a hole above the vessel,whereby the veflel may be filled with water, and then be stopt perfectly. Settvessel on the top of the Tower, as capacious as that beneath , and the leaden pipenow spoke o s , must be fastned at one end of the vessel, and go forth at the other end,and must be in the upper part of the vessel, and let the pipe be divided in the middle,within the vessel, and where the pipe enter<, and where the pipe goesout, theymust be joynted, that they take no air : when therefore we would have the waterto ascend, fill the vessel beneath with water, and (op it close that it take no air,then opening the lower hole of the veflel, the water will run forth; for that pareof water that runs out of the vessel, will cause as much to rile up at the other end bythe other leaden pise, ardalcend above the Tow.r; the water drawn forth is filledop again , we may make our use of it, and tbr hole being stopt, the lower vessel maybe filled again with water , and so doing we shall make the water to escend a ways.We may also

By heat alone make the water rife,

Let there be a vessel above the Tower, either of Brass, Clay, or Wood, Brass is bestslet there be a pipe in the middle of it, that may descend down to the water beneath,and be set under it, but fastned that it take no air: let the vessel above be made hotby phe Sun,or fire,for the air that is contained in the vessel rarefies and breathes forth;whereupon we shall fee the water rife into bubbles: when the Sun is gone , and thevessel grows cold, the air is condensed, anc because the air included cannot fill up thevacuity, the water is called in, and ascends thither.

"Chap. IV.

A difeription of water Hear-glojfes, wherein Wind or Water-Infiruments forteshew the Hours are described.

T He Antients had Hour-Dials made by water , and Warer- Dials were usual, andfamous. Heron of Alexandria writ Booksof Water-Dials , bu r they are lost.I have writ a Book of them, and that this part may not be deficient, 1 shall thew two

that