30 MISC. PUBLICATION 162, U. S. DEPT. OF AGRICULTURE 
F —222464, F—187464, F—185598, F—209901 
FiGguRE 17.—Some of the varied duties of forest officers. 
A. Before national-forest timber is advertised for sale, the trees to be cut must 
be marked by rangers. B, When the ever-watchful lookout discovers a spiral 
of smoke, he locates the fire on his map by means of the alidade and pro- 
tractor. The location of the blaze is then phoned to the nearest fire station, 
and fire fighters are sent to the scene of action. C, Grazing of sheep and 
cattle is allowed under permit on the national forests. In order that the range 
lands may not become overgrazed, the number of stock allowed each year is 
limited to what the range will carry without permanent injury. The rangers 
therefore keep a check on all animals entering their districts. D, It is highly 
important that all parts of the national forests where fire danger exists be 
accessible to fire fighters, and each year the Forest Service is adding to its 
mileage of roads and trails. Forest officers oversee and frequently take part 
in road-construction work. 
