THE USE BOOK. 175 



Trails through timber should be jweljMalazed. The Forest 

 Service has adopted a distinctive blaze for trails on the Forests, 

 consisting of a blaze^t_breastheight, with a notch above, which 

 should be used in all future work. For the benefit of the trav- 

 eling public, all Forest trails should be equipped with _sign- 

 bpards stating the name of _the trail, its destination, and the 

 distance in each direction to its terminal points. 



BRIDGES. 



Bridges should be built only where_fording is impracticable, 

 but when they are necessary should be strong enough and 

 placed so far above extreme high water that there will be no 

 danger of their being washed out. Rod iron and sawed lumber 

 should not be used where suitable logs can be obtained from 

 Forest timber. 



In making reports on proposed bridges, give the length be- 

 tween supports, height, kind and cost of piers or supports for 

 bridge ends, cost of cutting and hauling timber, cost of placing 

 timber in the bridge, and cost of nails, bolts, and other iron. 

 The use to be made of the bridge and the traffic it is designed 

 to carry should also be stated. 



-, TELEPHONE LINES. 



Telephone lines may he constructed in National For- 

 ests under special-use permits, and the Forest Service 

 will encourage and cooperate in their construction. 



Arrangements will be made as rapidly as possible 



t .construct telephone lines to connect the supervisor's 



headquarters with rangers' headquarters_and lookout 



stations, so that fires may be reported ancfother business 



^fThe^Forest conducted expeditiously. 



Cooperation will not be accepted unless those who 

 wish to cooperate will contribute a considerable part of 

 the cost of the line. The use of all Service telephone 



