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XXVI. A simple and accwafe Mode of co?ist)iicttng Gaso- 

 meters for Purposes uhere uinforrn Pressure is essential, 

 In/ the ylpplication of the Hydrostatic Regulator. By 

 Joseph StKEVENs, Esq. 



To Mr. Tilloch. 



SIR, 



X HAVE herewith sent you a drawing and description of a 

 gasometer constructed on the principle of n)y hydrostatic 

 resulator, described in your twentieth voluine, page 289, 

 which, I conceive) will be found fully as useful as the most 

 Complex and expensive instrument of this kind that has yet 

 been produced. I have endeavoured to he brief in my de- 

 scription, as the reader will easily comprehend the uses and 

 modes of employing the instrument from the descriptions 

 you have already published of other gasometers, and of the 

 hydrostatic regulator already referred to. — I am, sir. 



Your obedient servant, 



Garlic Hill, JoSEPH StEEVENS. 



March 8, 1806. 



A tin vessel, A, (Plate V.) of 12 inches diameter and 12 

 inches deep, is supported by four pillars p, p, p, p fixed at 

 the top into the circular piece of wood m,m, and at the bot- 

 tom into the wood base cj q about an inch and a half thick, 

 and hollowed out in the middle to receive the convex surface 

 of the vessel B, on which it is fixed by means of the loops 

 and hooks 0,0,0,0: through the base q q two holes are made 

 to allow the cocks ^c to pass, for readily removing B for 

 the purpose of filling, &c., though by having a cock near 

 the bottom it may be filled in its present situation. The 

 vessel B is about 13 inches diameter and 10 deep, d h 3. 

 collar -of leathers fixed to the vessel A, through uhich a 

 metal tube de passes, extending down the tube /^ to e. 

 To the cock g a recurved tube is fixed, and so bent that it 

 returns and nearly touches the upper part of the gas-holder B. 

 A slip of metal mav be placed diagonally under this tube, to 

 prevent the noise of the water while running from A to B. 

 The vessel A being filled with waler^ and B with g^s, in the 

 L 2 usual 



