140 PHILOSOPHICAL TRANSACTIONS. [aNNO 1726. 



ground, or turned to a true flat. 5. Is a hole of about li inch diameter, to 

 receive the nose of a cock, which is put through it, stopping with a shoulder 

 or flaunch screwed within the circle oo by 4 other screws, marked with large 

 points round the hole 5. 



In fig. 8, NN is the same plate seen edge-wise, m is the air-cock, screwed 

 to the said plate through the flaunch of its pipe at mn, having its key 6, 10, 

 fastened to a rod of about -^ an inch diameter, of the figure 6, 7, 8, 10, having 

 a shank one foot long, 8, 9, joined to a buoy or hollow copper ball l, which 

 ball, when the said shank is in an horizontal position, keeps the cock shut ; but 

 falling by its own weight, when not sustained by the water, opens the cock by 

 means of the rod 8, Q, as may be seen in fig. Q, where the plate nn is screwed 

 to the box, and the pricked line ml shows the surface of the water coining into 

 the box through the great cock and leaden pipe hi, so as to make the ball l 

 float with its shank in the horizontal position 8, Q ; but when more air comes 

 in to drive the water down the pipe i, the buoy will fall to 1, and its shank 

 coming down to 10, 1 1, will open the air cock m, and let out the air, be its 

 density what it will, till it be all discharged, and the water is again got up to 

 ML, and has raised up the buoy to l. nn is the fore-part of the box, with its 

 hole, to which the plate of fig. 7 is screwed. 



It is easily conceived, that the cock h must always be left open ; that the end 

 of the pipe i is screwed to a hole in the bottom of the box by means of screws 

 at rr ; that there are oiled leathers at the heads of all the screws, and likewise 

 on the plate nn, to make the face oo of fig. 7, apply itself close to the fore- 

 part of the box K, fig. 10, which has a hole at oo, to take in the buoy and 

 cock of figure 8, the screws at 1, 1, 3, 4, which have their heads within the 

 box, and their nuts, such as b, fig. 7> screwed on, when the plate nn is applied; 

 and that the whole box thus fitted, is made air-tight. 



D in fig. 6, and dd in fig. Q, represent an iron door, to cover the mouth ot 

 the air-cock from external injury, and is punched full of holes to let out the air 

 freely. 



This machine, which, from its make, was called a jack in a box, will be use- 

 ful wherever water is to be conveyed a great way in pipes ; and since the Doctor 

 was not the sole contriver of it, in justice to those who joined their thoughts 

 with him, he acquaints the public, that the box is the joint invention of Mr. 

 Richard Jones, Mr. James King, Mr. Thomas Newcomen, Mr. Joseph Horn 

 blower, his operator, and himself. 



