294 Engine for raifing Water hy the lateral 



G a fmall tube pafllng through the tube F, and rlfing to near the top of D, for ad- 

 miflion of air to quicken the defcent of water out of that veflel. Both thefe tubes are 

 clofed at their lower ends by the lever L, which is fixed upon a cock in the tube E, and 

 has a weight upon one end, in order that the other end may bear againft the openings of 

 the tubes, at the fame time that it fupports the veflels I, which is fufpended upon it by a 

 cord or wire. The upper furface of that end of the lever which comes in contaft with 

 the tubes, muft be covered with leather, and muft prefs againft them with confidcrable 

 force, that the veflel D may be perfe£tly tight when the ends of the other two tubes are 

 placed in water. 



H a fmall ciftern, provided with a fyphon, to be filled with water from the refervoir A, 

 at the fame time with D ; this muft be done by regulating the cock k, upon the pipe 

 which fupplies H with water. 



I a fmall veflel and fyphon fufpended from the lever L. 



The operation of the engine will be as follows : 



The refervoir A being conftantly full of water, and the conical tube B completely filled 

 at its wider end by the water which runs out of .\ ; the force of the lateral motion being 

 encreafed by the form of the tube B, and afting upon the end of E, will rarify the air in 

 D, and the preflure of the atmofphere upon the furface of the water in the refervoir, will 

 caufe part of that water to rife in the tube C to run over its top and fill D, then to defcend 

 through E, and enter the ftream which flows out at B. 



When D is full of water, if the tubes F and G are opened, the water will run out ; 

 therefore, foon after D is full, H is full alio, and the fyphon of this laft veflel beginning to 

 empty the water, fills I, which overbalances the weight upon the lever L, and opens the 

 pipes F and G, and clofes the cock in E : the column of water in C immediately defcends 

 into the refervoir, and if the fmall tube G be full of water, it will be emptied by the 

 defcent of that column, admit air into D, and the water will flow out at F. The veflels 

 D and H will be empty of water about the fame time, and the veflel I, by its fyphon foon 

 after : the weight upon the lever L will then clofe the tubes F and G, open the paflTage 

 through E, and the water will rife into D as before. 



If the water fliould defcend through E, before F and G arc opened, it will render the 

 cock in E more tight. 



Experiment i. The vefl"el D was conllrufted of a cylindrical form, one inch and three 

 quarters in diameter, and two inches in height, without the tubes F and G, but with two 

 holes, one to let out water, and the other to admit air, both clofed with wooden ftoppers. 

 The tube C was three-eighths of an inch infide diameter, and the tube E, one-fifth of an 

 inch in its internal diameter : this laft was placed within the tube C for readinefs of con- 

 ftruflioHj its upper end was flanted ofi^, and touched the top of D, and it was confined in 

 its place by a wedge of wood thruft into the bottom of C. A conical tube, nine inches 

 long, one inch diameter at its fmaller end, and one inch and three quarters at its wider end, 

 was fixed to the fide of a refervoir eight inches deep. The depth of the water in the 

 4 refervoir 



