ATKIXSON^S BOILER. 



41 



be kept at about sixty degrees, diyiding the cubit measurement of the 

 building by thirt\' mil give the required quantity of pipe, and for forcing 

 houses "where it is desii'ed to keep the temperature at seventy to seventy 

 live degrees, we must divide the cubic measurement of the house by 

 twenty, but if the temperature be required as high as seventy five degrees 

 or eighty degrees, then we must divide by eighteen to obtain the number 

 of feet of fom' inch pipe. If the pipes are to be three inches diameter, 

 then we must add one thii*d to the quantity thus obtained, and if two inch 

 pipes are to be used we must take double the length of four inch pipe." 



HOT WATER APPARATUS. 



Having thus far given a brief detail of the leading points in the theory 

 and practice of heating by means of hot water, we shall now give as 

 briefly as possible the essence of what we deem to be the best method 

 recommended for use, and take them as near as possible in the order in 

 which they stand as to priority. 







\ 





1 





1 \ 



Atkinson's original plan consisted in simply connecting the boiler «, 

 with the reservoir I, by means of two horizontal tubes, and sometimes 

 without a reservoir, as in figure 2, the uppermost intended for the heated 



water to flow through towards the reservoir, and the lower to conduct it, 

 when cooled, back again to the boiler, entering it near the bottom. The 

 boiler and reseiwoir had covers, which could be taken ofi" or put on at 

 pleasure, the former being of wood, which, being a nonconductor of 

 heat, prevented too great an escape of heat at the end, which naturally 

 would be the warmest part of the house ; the latter was of cast iron, but 

 was very seldom used. For all ordinary purposes this apparatus was found, 



