certain points are omitted, the value of the work is very much
decreased. The sketcher must clear the sketch of all unnecessary lines
and notes and make his lettering clear on the map. Be sure that the
following items are on the sketch before it is turned in.

1. Location of the ground shown.
2. Line of magnetic north shown by an arrow, and if declination is
known, the true north also.
3. Graphic scale and representative fraction--R.F.
4. Vertical interval--V.I.
5. Sketcher's name and organization to which he belongs.
6. Date.

A landscape sketch is a place sketched with details shown in
perspective. The horizon is always of military importance and should
be shown as well as intervening crests, woods, houses, etc. Landscape
sketching in trench warfare is a necessary accomplishment of the
observer. The beginner will at first be confused by a mass of details,
but he must note only the outline of the features sketched. First draw
the sky line and crests, then fill in the other details with fewest
lines possible. Unnecessary shading tends to detract from the
clearness of the sketch. There will be great difficulty in getting the
perspective, note the size of objects, the further away they are the
smaller they seem. Make them so. In making the sketch, hold the pad in
front with one eye closed, the upper edge of the pad horizontal; a
string 20 inches long is tied to the pad and held between the teeth to
insure the same distance from the eye each time. Moreover, if it is
desired to locate objects by deflection of an angle from a reference
point, this can be done by using _mils_. One mil is 1-6400 of a
circle. At 20 inches a half-inch interval subtends 25 mils.