44 INSTRUCTIONS FOR MAKING FOREST SURVEYS, ETC. 



of the new Forest Service trail between Wild Cat Ranger Station 

 and Alta Lookout Point. Established for witness red fir 20 inches 

 in diameter, on north side of trail, 40 links distant from intersection, 

 marked 1 on north side and X on south side. 



October 4, 6 p. m. Made a record of the above information on 

 the atlas sheet. 



JOHN R. UNDERWOOD, 



Ranger. 



It is important that any geographic information 

 which may be used to correct the atlas sheets, and 

 thus lead to the preparation of accurate forest maps, 

 should be placed upon the sheets which are kept for 

 that purpose by each forest officer. All of such cor- 

 rections or additional data should be transmitted to 

 the supervisor as he may require them, but certainly 

 in ample time for him to include them in the corrected 

 folio which he sends to the Forester on February 1 of 

 each year. 



Other marks used by the Forest Service are described 

 under "Ranger station surveys" and "Forest home- 

 stead surveys.'' 



FIELD NOTES. 



Notes of survey should show exactly what was done 

 in the field, including the errors of courses or measure- 

 ments. In resurveying lines, it is no reflection on the 

 survey party if it does not "check up" exactly, but it 

 is rather expected that a trial or "random line" will 

 not strike a corner nor the measurement prove exactly 

 as "returned" by the original surveyor. It is im- 

 portant, however, to know what the error or difference 

 is discovered to be. 



When a notebook contains the field notes of only one 

 survey, the purpose of which the survey was made 

 should be plainly marked on the cover as well as on 



