RANGER STATION SURVEYS. 53 



corners, which will be set up at each angle in the bound- 

 ary; and witnesses, to which, whenever possible, each 

 monument and corner will be tied. 



Forest Service Monuments. The object of these mon- 

 uments is explained under the subject "Tying in." 

 They will be similar to the mineral monuments of a 

 mining district. They should, if possible, be immov- 

 able and durable, and easy to locate at any future 

 time from the field notes' of the survey. A large 

 bowlder or a built-up stone monument will serve the 

 purpose, or a sound tree of long-lived species. Where 

 there are no trees a wooden post may be used. Monu- 

 ments will be marked F S M The witnesses for a 

 monument should be permanent objects from which 

 at least two cross bearings can be taken to locate the 

 monument in the future if necessary. They will be 



marked ^ 



At each angle in the boundary of a ranger station 

 a durable corner will be established similar to those of 

 the land-office surveys. Each corner post or stone 

 will be marked near its top with the letter R and 

 below this the number of the angle at which the cor- 

 ner is set, beginning with the initial post as number "j 

 and counting on in regular sequence around the bound- 

 ary in the direction of the survey. Thus the monu- 

 ment of the third corner will be marked 5 



o 



At least two witnesses will be made near each corner, 

 and will be marked with the letter W and the number 



of the corner, thus: W 



