Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...equally as satisfactory as the ravine to sight on.) Move at once to the top of hill Z and place yourself on the direction line from C, at the most convenient point of the hill for observing the ground (on road Z L). Set up and locate your position by resection on K, and sight the stream junction toward K, also the draw S by estimating its number of yards from Z. Sight along the general direction of road L Z. You observe that a hedge fence extends along the western boundary through Q. You have not located this hedge, but observe that you will be able to do so by intersection from Z and K on two of its points, Q and R. Therefore, sight from Z at these two points on the hedge, then move to K and complete their location. Draw in the hedge B Q, thus locating all the critical points sighted on this line from E. From K locate the critical points on road A B as described above. Draw in all the water course and water shed lines west of the railroad, for which sufficient critical points are now known; also the other details such as roads, trees, houses, wire fences, etc. It will be observed that the horizontal details of this sketch have been put in by use of the methods of traversing, offsets (along the base), intersection (d, m, k, q, etc.), and resection (z). S was located by estimation, since it was only about 200 yards from Z. A small amount of estimating has been done in getting the directions of ravines and of water sheds of ridges, between the two or more points located on them. Gradually you can increase the amount of freehand sketching based on estimation as you acquire skill from practice. The portions of the area located by resection, intersection or traverse will vary in amount for each particular sketch, depending on the nature of the ground, the amount...
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