Oil and Coal for Fuel 57 



perattire up about 10 degrees above the minimum during 

 the frosty period. The greater number of the heaters 

 should go around the outer rows of the orchard with a 

 smaller proportionate number through the middle. This 

 arrangement protects the outside rows, which in turn keep 

 the middles from low temperatures, and also enables the 

 workmen to handle the heaters with the smallest amount 

 of labor. 



A Cement Tank used for Storing- Oil. 



Heaters need not be distributed until about the time 

 the buds are beginning to open, and should remain in the 

 orchard until well after the last frost has passed. The 

 fires need not be lighted until the temperature has reached 

 the freezing point, and if it is well past midnight, only 

 about half of the heaters need be lighted on the start, so 

 as to hold the remainder in reserve, and to economize on 

 coal. Where the work has been arranged for in advance, 

 and has been systematized, many growers have found that 

 two men can look after the heaters on three acres. 



