[Illustration: Fig. 2, Fig. 3, Fig. 4]

Now make a drawing of the survey. Draw on paper a line corresponding to
the line AB, making a certain scale, say 100 feet to the inch. If the real
line is 200 feet long, the line on the paper will be 2 inches. With the
protractor the angles at B and A may be drawn or plotted. This will give
the location of the point C. With the scale determine on the plan the
length of the other sides of the triangle ABC. The actual distances should
next be measured with the tape to test the accuracy of the survey.

Next place a stake along the side of the lake at a point D. Then in a
similar manner measure the triangle with the transit. With the protractor
the lines AD and BD can be plotted on the plan. With the scale the length
of the lines AD and BD can be estimated from the map. The rest of the lake
is surveyed in the same manner. It is only necessary to take other points
on the lake and survey the resulting triangles. It is a good idea to use
four-foot stakes with flags placed so as to be easy to sight to them.

Finally a tracing may be made with carbon paper giving only the shore line
and leaving out the lines of the triangles and the map is finished. The
boys in one camp surveyed a lake a mile long with home-made instruments
with excellent results.

Boys should be taught how to use the compass and a map in tracing their
way through an unknown country. Also to travel by the stars or by the moss
on the trees.