WARD: INCREASING THE CAPACITY OF STEAM HEATING PLANT. 153 
On special occasions when Library Hall only is heated the 
weight W is placed out on the end of the arm and the other 
buildings will not be heated. When heat is not wanted in the 
library and is needed elsewhere the weight is removed entirely. 
This requires but little time and is all that is done to operate both 
valves and equalize the heat. 
When the weather is not too severe the boilers are capable of 
supplying the demands, but they are taxed to their utmost when 
the wind is very cold. 
