Plane Table and Forest Maps 455 



J4"X/4"X1", by means of a pair of pincers, later the block to be 

 whittled to a convenient size. A very convenient way to carry 

 extra needles (all mounted) is to have a piece of cork fastened 

 inside the instrument case into which they may be stuck. A 

 piece of cork may be fastened in one of the leather pencil holders, 

 in the compartment made for the scale, and several needles 

 carried there. The needles may be stuck in the sealing wax by 

 slightly warming the wax and heating the needle quite hot. 



A sandpaper pencil sharpener may be fastened on the under 

 edge of the board by tacks and is always handy. If a flagman 

 is used at a distance, he can easily be located or signaled to if a 

 pocket mirror is carried. 



The tracing cloth or graphic method of solving the three-point 

 problem is the most rapid and the most satisfactory for secondary 

 work. The chief objection is the trouble in handling tracing 

 cloth in a wind. This may be overcome by using a sheet of cel- 

 luloid with a needle hole in it and thumb tack holes in the cor- 

 ners. The lines can be erased easily, and if the needle hole be- 

 comes enlarged a new one can be made. The stretching and wrin- 

 kling of the tracing cloth is also avoided by the use of celluloid. 

 This method can also be used to find the approximate location 

 in using the more accurate Coast Survey Method. 



SAMPLE NOTES 



July 20 Sta. II 



(From) Sta. II Log. Tan. V.d. =9.08283 



Set up over section corner on r r-^ _ 2.47494 



township line between sec. 33 1 55777 



and sec. 34, T. 8 N., R. 14 E. 



B.M CaUed this Station II. El. d. =36.122 chs. 



oriented on sec. cor. between sees. 19bO. 



34 and 35. Elevation 8450 feet. 396. 



H.S. 25' (height of signal) H.I. 4'. 6.6 



1.32 

 .13 



(To) No. 8 2384.05 feet 



Flag on highest peak east of Clarke's. 4. (H.I.) 



V= 36°42' 8450. (El. of Sta. II) 



L= 29° 48' 



V.d= +6° 54' 10838 . El. of No. 8 flag 



D = 298.5 chs. 20. Ht. of signal 



10818. El. of No. 8 gr. 



No. 9 



Mountain top N. and beyond 



S. Fk. of Champion Cr. Timber 



on south. 



