16 Farmers’ Bulletin 1185. 
THE BOOM. 
The boom which carries the nozzles and supplies them with liquid 
from the pump is made of 2-foot pieces of 4-inch galvanized-iron 
lie. 9.—Parts of strainer shown in figure 8. 
pipe, joined by tees, each of which affords an opening for the attach- 
ment of a nozzle. The boom may be all connected in one piece, in 
which case a cross must be used in place of one of the central 
