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[Page 12]
3. Select a base line. It should be a line fairly central in the sketch: about ½ a mile long. The ends should be clearly marked & visible from entry points & each other - it should be on fairly level country.
Measure the base, - This by carefully pacing it. The accuracy of the triangulation depends on the base.
When the base has been determined plot it on the sketch.
Obtain the position of ruling points by intersection.
Fill in the detail mainly by intersection. Detail that cannot be filled in by this means should be traversed.
2, Plan Table Prismatic Compass. Care Sketching board, protractor & Clinometer.
4. Col. depression in a ridge joining an under feature or offshoot to the main ridge. A break in a ridge.
Watershed - is the high ground which divides the direction in which the water runs, or separates two drainage basins.
bearing - is the angle which a place or point is from the north. Gradient is the slope of a hill or rising ground and is expressed by 1/20 - means a rise of 1 in 20v.
H.E. Horizontal Equivalent, the distance in plan between