EXPERIMENT STATION BULLETINS. 



203 



The temperature chart (Fig. 20) shows the outside temperature, the 

 temperature of each house at 6 a. m., and the amount of coal daily con- 

 sumed by each heater. With only one exception the daily amount of coal 

 supplied the steam heater was equal or greater than to the water heater. 

 It was also noted that whether the magazine was used or not, the steam 

 heater required more frequent attention than the water heater. 



The temperature of the water-heated house, as shown both by the record 

 and the chart, was as a rule higher than that of the steam-heated house, 

 and on the few occasions when it fell below, it will generally be found that 

 the steam house has received a considerable excess of coal. By comparing 

 the record with the chart a slight error will be seen in the latter for Janu- 

 ary, when the figiires of the temperature of the hot-water house for the 

 4tli to 14tli, average about one third of a degree lower than they do as 

 recorded. 



For the month of April the two systems were compared in a different 

 manner. The same amounts of coal were supplied to each, with a result- 

 ing temperature, as will be seen by the table, in the hot-water house seven 

 degrees higher than in the steam-heated house. 



It may be well to note that, as a rule, throughout the test, no steam 

 pressure was carried. Occasionally it would run up to two pounds, but at 

 that point the automatic damper regulator shut off the draft and opened 

 the check damper. 



