First prepare a cestern, as A, B, C, D, partition in the middle, let there bee made two pipes, the one whereof must reach out of the upper cestern, and descend almost to the bottom of the lowest cestern, as I, K; the other must be a short one, and haue a very small hole, that the water may thereby issue out of the upper cestern but by drops; also at the side nigh the bottom of the upper cestern, let a small pipe enter. To the upper cestern fit a board, (with a peece of lead nayled upon it to make it somewhat heavy) so that it may easily slip up and downe in it; this board must haue a loop to fasten a rope unto, and you must so poyse the said board, that it being hung up by a line, may hang even, and levell. Then prepare a box to put ouer the cestern, which ought to stand about six inches aboue the cestern. In the top of this box let there be fastned a long pulley with a creuice to put a small rope ouer, in this creuice it were fitting to fasten small pins, to the end that the rope might turn the sayd wheele as the water faleth from under the board: let the spindle of this pulley come out at one side of the box whereon there is a Dyall drawn, contayning so many houres as you would haue it go for; unto this end of the spindle let there bee fitted a needle, or director, to shew the houre, then put a small cord ouer the pulley in the box, fasten one end thereof to the loop of the board, and at the other end let there bee tied a waight not quite so heauy as the board, then fill the upper cestern with water, and the board will presse it out into the lower vessell, at the pipe O, drop by drop, and as the board sinketh lower, it will by meanes of the rope upon the pulley, turne the index fastned unto the spindle of the pulley about the dyall; you may set it by an houre-glasse or Watch: when it is quite downe, if you doe with your mouth blow into the pipe at the side of the cestern, the water will all mount up againe into the upper cestern. [Illustration] _A wheele which being turned about, it casteth water out at the spindle._ Let A, B, be a tub hauing in the bottom a brasse barrell, with a hole open quite through one side of it: let D, E, F, be a wheele, whose spindle must bee also hollow, and haue a hole through one side of it, so that being put into the hollow barrell, both the holes may be equall together. Note then, that so long as these holes are equall together, the water will run out at the spindle of the tub, but if you turne the wheele to another side, it will not run. [Illustration] _A water-presser, or the mounting of water by compression._