CONTENTS. 



Page. 



Elements of surveying and mapping 5 



Instruments used 7 



Forest Service standard compass 9 



The pocket compass 14 



Magnetic needle 16 



Variation 16 



Observing Polaris 18 



Observing the sun at noon 21 



Plane table 23 



Aneroid barometer 28 



Hypsometer ,. 29 



Details of surveying 31 



Measurements 31 



Concerning accuracy 31 



Traverse 32 



Blazes and marks on trees 41 



Field notes, etc 44 



Elevation from vertical angles 50 



Tying in 51 



Ranger station surveys. 52 



Forest homestead surveys 58 



Trail surveys 59 



Platting the surveys 64 



Map making in the field 64 



The Forest Atlas : 66 



Conventional signs 69 



Lettering , 70 



Color prescriptions 73 



Forest Atlas crayons 75 



Mounting maps on muslin 76 



3 



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