Traverse Board 
a line is drawn in its direction. The distance between the 
two points is then chained or paced, and when this has 
been scaled off a second point on the map is obtained. 
The board must then be set up at the new point and 
oriented as before, when, the ruler being swung about the 
new point, a ray may be drawn from it to a third, and 
so on. Little difficulty will be experienced by one who 
understands compass surveying in working this instru¬ 
ment. A point on the sheet always represents the point 
occupied, and that is always the point to work from. 
The map is carried to completion right in the field and 
that, as regards both cost and accuracy, constitutes the 
advantage of the method. 
THE TRAVERSE BOARD 99 
on it is known by the crossing of a section line. The 
instrument should be set up at the known point, with one 
edge of the board set north and south as shown by the 
needle. A point is then chosen on the sheet to represent 
the one occupied on the ground, the edge of the ruler is 
swung about it until the sights range toward the second 
point to be occupied, say the next turn of the stream, and 
