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Mr. Mackain on ExttTigvishing Fires. 





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 House. 



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From the bottom of the water vessel, conduit-pipes may be carried 

 and connected with others leading into the second floors of the factory 

 below, and above the water vessel, to a height nearly equal to the dis- 

 tance between the water vessel and the air vessel yet to be described ; 

 and from these pipes, others fitted with fire-cocks may ramify through 

 the entire extent of the buildings. 



Nearly on a level with the ground is placed another receiver, marked 

 in the sketch as the air vessel, and formed of the same materials as 

 the water vessel, but of double its capacity. A pipe, I, g, fitted with a 

 stop-cock, ky leads from the bottom of the cistern to nearly the bottom 

 of the air vessel. 



Another pipe, h, also fitted with a stop-cock, i, is attached to the 

 bottom of the air-vessel, for emptying it, after it has been filled with 

 water. An air-pipe, /, e, is conducted from the top of the air-vessel, 

 to the top of the water vessel, to which it descends with a curve, after 

 having been carried to the height of the top of the cistern. 



The apparatus being thus arranged, the presence of water in the 

 cistern will raise the valve, b, on the curved pipe of the water vessel, 

 and flow into it ; and the lower cock, i, of the air vessel being opened, 

 the air contained in the water vessel will be discharged by the air 

 pipe, and the vessel will be entirely filled with water. If the cock, i, 

 be shut, and the cock, k, be opened, the water wiU flow from the cis- 

 tern into the air vessel, compressing the air in it, and in the air pipe, 

 / €y with the force due to the height of the column of water in the 

 pipe. The compressed air will thus act, through the air pipe, on the 



