ttached compass (Fig. 2);

2. Loose ruler, on board (Fig. 2);

3. Rough tripod or camera tripod;

4. Scale of M. D.'s (shown on ruler, Fig. 2);

5. Scale of sketchers, strides or paces (at six inches to one mile),
on ruler;

6. Clinometer (not necessary if board has slope board, Fig. 6);

7. Scale of hundreds of yards shown on ruler;

8. Scale of paces.

Methods to be used

(1) Select a base line,--that is, a central line 1/4 to 1/2 mile long
in the area to be sketched. It should have at its ends some plainly
marked objects, such as telegraph poles, trees, corners of buildings,
etc., and from its ends, and intermediate points, a good view of the
area should be possible. The base line selected should be capable of
being measured.

(2) Set up, level and orient the drawing board at one end of the base
(A), Fig. 1, Y, for example. Draw a meridian on the sheet parallel to
the position of the magnetic needle. Assume a point (A), Fig. 1, Y,
corresponding to the ground point (A), 890, on the sheet, in such a
position that the area to be sketched will lie on the sheet.

(3) Sight at hilltops, stream junctures, stream heads, etc., to begin
the locations of these points by intersection, labelling each ray so
as to be able to identify it later.

(4) Traverse to (b) and complete the locations by intersection as
previously explained. If the base line is not accurately measured, the
map will be correct within itself in all of its proportions, but its
scale will not necessarily be the scale desired.

(5) Draw the details of the country between A and B and in the
vicinity of this line, using the conventional signs for roads, houses,
etc.

(6) The lines from station (b), Fig. 1, X, to any of the other located
points may now be used as a new base line to carry the work over
additional area.

(7) In case parts of the area are not visible from a base line, these
parts are located by traversing as before explained.

(8) Having learned by several repetitions the above steps, the
sketcher will then combine contouring with his horizontal locations.

=1890. Outpost sketching.= The same instruments are used as in
position sketching, and so are the methods the same, except that the
sketcher cannot advance beyond the outpost line, toward the supposed
position of the enemy. It is often possible to select a measurable
base line well in rear of the line of observation,--for instance,
along the line of resistance. Secondary bas