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HOT T^'ATER APPARATTS, 



smoke and hot air in the cMnmey. similar to a common smoke jack ; the 

 centrifugal force of tliis morion vrill so act against the fluid in the pipe 

 terminatmg in the circumference, as to cause the water to rush down it 

 while it draws it up the other. 



By this means either hot or cold water can be made to chculate, the 

 circulation depending on the centrifugal force, and the mouth of one pipe, 

 being in the centre of the boiler while the other is in the circmference, 

 a greenhouse or stove, therefore, may be heated from a boUer placed over a 

 common fire in a gaiTCt, and the water carried downwards to the pipes or 

 reseiToir in the house. The singularity of this invention is the power 

 it possesses of forcing hot water downwards, a result not anticipated, 

 and also in the rapidity of the circulation which admits of tubes being 

 used of much smaller size than usual, a matter of great consequence in 

 some cases. 



Greenhouses, stoves, 6cc., are sometimes heated by the waste heat of 

 domestic fu-es, and as we have already shown that hot water can be made 

 to circulate either upwards, downwards, or horizontally by adopting some 

 of the methods aheady detailed, it will be evident that any greenhouse, 

 stove, plant verandahs, or other structm-e may be heated either from the 

 kitchen, parlom-, or drawing room fire as may be most favom-able, without 

 the leELSt inconvenience, and at scai'cely any additional expense. 



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The annexed figure shows a'fii'e place upon this principle, invented by the 

 venerable curator of the Chelsea botanical garden, it consists of a grate sur- 

 rounded by a boiler which fonns the back and sides of it. The fire is in- 

 tended for the usual domestic purposes, and the water heated by it is carried 

 tlu-ough the wall into the greenhouse behind, by means of a pipe which 

 may be placed in the most convenient manner possible, according to the 

 form, size, and chcumstances of the house. The water when cooled 

 retm-ns again to the boiler by the lower pipe^ which enters at the opposite 



