MAPS AND RECORDS. 



97 



edge has a mark in the middle opposite the 90^^ mark 

 on the circumference. 



To lay off any angle at any point place the straight 

 edge of the protractor on the line with the mark at the 

 point ; with the point of a sharp pencil make a mark 

 on the paper at the required number of degrees and 

 draw a line from the mark to the given point. 



To plat compass 

 bearings draw a merid- 

 ian line in light pencil 

 throug^h the initial sta- 

 tion ^r starting point, 

 place the protractor 

 upon the line and point 

 as directed in the pre- 

 ceding paragraph, and 

 lay off the angle called 

 for by the notes. Setoff 

 by scale the distance on 

 this course to the next 

 point. Draw a merid- '^^' 

 ian line through the 

 point thus established 

 and in the same mannet 

 plat the next and fol- 

 lowing courses. Should 

 a field have been sur- Fig. 21.- 

 veyed, the last course 



should end at the starting-point and the plat should 

 come together or close. If it does not close, it shows 

 that some error has been made either in the field or in 

 platting the work. The method of using the protractor 



-Platting Compass Bearings. 



