84 



A MANUAL FOB NORTHERN WOODSMEN 



along with the amount of the deflection. Notes may be 

 kept as follows : 



In any case, a sketch kept on the right-hand page of the 

 note book will be an aid to clearness. The whole survey, 

 indeed, may be recorded in that form. 



A Survey or Traverse by Azimuths. Azimuth is the 

 angle which a line forms with the meridian, or with any 

 other line which is selected as a basis. It is similar to bear- 

 ing, but is measured in one direction, commonly from 

 south around through west, north, and east up to 360, and 

 transits are commonly graduated so as to be read directly 

 in this way. The method of work is as follows : 



Set up on the initial point of the survey, set the zeros of 

 the two plates together, clamp them, and turn until the 

 telescope points south, as shown by the needle. Clamp 

 below, loosen above, and point the telescope at the second 

 point of the survey, recording the angular reading, and the 

 bearing for a check upon it. Clamp above and loosen 

 below. Measure the line. 



Set up 'over the second point, revolve the telescope, and 

 turn on the first point, making sure not to start the upper 

 clamp at any time during the process. Clamp below ; then 

 revolve the telescope into its natural position, loosen above, 

 and turn on the third point of the survey. The azimuth of 

 this line may now be read off the plate and bearing by the 

 needle for a check. Measure the second line. Proceed in 

 tliis way until the survey is completed. If the survey is a 

 closed one, when the transit is finally set up again at the 

 initial jx>int, the azimuth of the first line should be the 

 same as it was at the beginning. 



