HEATING 45 



The vacuum system is used on several large places in 

 the West, where the country is flat and the cost of sinking 

 the boiler house is expensive. This requires a more or 

 less elaborate system of traps and pumps, as the water has 

 to be drawn from the heating pipes by one pump and pumped 

 into the boiler by another, which necessitates the carrying 

 of a high pressure on the boiler and the use of a reducing 

 value of the heating systems. This system we should not 

 say was economical on any except the larger places, such 

 as are found in the outlying districts of Chicago. 



The trap system is used principally through the 

 West, and in places that draw their supply of steam from 

 some central power station. There are various makes of 

 good traps on the market for the florists' use, and the 

 manufacturers gladly give all details as to the proper 

 installation of the same. The rules of keeping the boiler 

 clean apply to either the hot water or steam systems. 

 Either of these systems must be kept water-tight or steam- 

 tight, as leakage in the piping is leakage in the coal pile. 



Some florists have tried the burning of a low grade of 

 coal by the use of forced draft, but we should not say 

 that it was economical, as it requires an engine, high 

 pressure steam, and a fan, which draws more or less ef- 

 ficiency from the boilers to operate it. 



Put cold water into the system on sunny days, when 

 it will heat up gradually, or at such time as the temperature 

 of the water is higher than necessary. 



On a steam system, water should be put into the 

 boiler very gradually, as cold water in large amounts will 

 take away all the steam. Do not put water into a steam 

 boiler when it does not show in the glass : you do not want 

 to wreck your place, and life is too short as it is. 



The chimney is as important a thing as anything in 



