Bui. 1465, U. S. Dept. of Agriculture 
Plate 3 
A— The Watering Machine in Position for Operation 
The two rows of cans are arranged with the watering pipe toward the machine 
and far enough apart to permit opposite cans to be reached by the flexible 
metal hose at the* same time. After being flamed the vent caps are removed 
and the ends of the metal hose flamed and inserted in the can, the cuff coming 
over the outside of the pipe. The mittens which cover the end of the hose 
when no water is being delivered are shown above, on top of the calibrating 
plungers. This figure also shows the method of attaching a soil thermograph 
B— Concrete Troughs Containing Cans 
In these troughs the soil cans were set in water for the purpose of maintaining a 
more even temperature. The water could be changed at will 
