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SOME REMARKS ON HEATING. 



are not irregular or undulating. A cistern by which the appa- 

 ratus is to be filled and afterwards supplied must be provided, and 

 may be fixed in any convenient corner of the house or stoking 

 pit. This cistern must be placed higher tiian any portion of the 

 apparatus, and attended to as occasion may require, in order that 

 the pipes may be constantly kept full and steam prevented from 

 accumulating, or air admitted to interfere with the motion of the 

 water. 



When two or more houses are to be heated by one boiler, 

 stop-cocks will be required to stop the flow of the water. These 

 are often found extremely inefficient, or otherwise very expensive ; 

 and unless the building is very circumscribed, one boiler will 

 be found as economical, more efficient, and easier controlled than 

 a combination of mechanical appliances. 



These observations will be readily understood by those to 

 whom a hot water apparatus has hitherto presented a mechanical 

 problem not readily solved. Let us hope that they may prove 

 useful. 



The following cuts represent Mr. Hood's mode of setting his 

 arched boilers : — 



