Fig. 10
(2) Important points in the vicinity, such as the railroad bridge, the stream juncture, hilltops, are sighted for intersections, lines drawn as shown and the sketcher traverses to station 2.
(3) At station 2 he locates and draws in all details between station 1 and 2, to include about 300 yards on each side of the road.
(4) The traverse is then continued forward as described for 1 and 2.
(5) After some practice of horizontal sketching, as just described, the sketcher will be able to take up contouring in combination. The methods are as described in the paragraph on contouring.
(6) When the traverse runs off the paper as at A, [Fig. 10], the following method is followed: Reorient the board so that the road forward will lie across the long dimensions of the paper; draw a meridian parallel to the compass needle and assume a point on the new sheet corresponding to the last point (A) plotted on the first sheet.
(7) On completion of the sketch various sections will be pasted together, so that all the meridians are parallel.
[1892]. Combined sketching. Let us suppose that we have the rectangle W, X, Y, Z, [Fig. 11], assigned to us to map and that we have been given four sketching parties, and that the locations and elevations of A and B have been previously determined by triangulation and are plotted to scale on our rectangle.
A logical step would be to carefully plot the line a' b', and then the lines c' c" and c" d.