116 FOREST PROTECTION AND CONSERVATION 
the scale of 500 feet to the inch having been made, tracings are 
prepared from these enlargements, with proportional reductions 
for topographic lines, roads, and other minor features. 
Black line prints from these tracings furnish the actual base 
maps for the field work and for the finished map of the area. 
FIELD WORK 
Two men with experience in sketch and topographic mapping 
are assigned to this work, at the rate of $3.50 per day for actual 
time worked and expenses while in the field. 
One copy of each map is cut into small sections, of convenient 
size for sketch mapping in the field. Hand sketch boards are used 
for the work, and the map is first covered with a system of rectan- 
gular codrdinates in light lines at intervals of one inch in each 
direction, showing the magnetic bearings. A hand compass and a 
six-inch rule, graduated in tenths, are the only instruments needed 
in the field work. 
The forest type lines are drawn on these maps, checking on the 
magnetic lines and on the roads, streams, topography and other 
features shown on the base map. 
Particular attention is given to locating accurately all areas of 
white pine according to a classification given herewith, and to 
making an estimate of its value. 
The area of each block of white pine is obtained as accurately 
as 1s consistent with the method used, which involves pacing for the 
distances and checking in on roads and other features shown on 
the base maps. 
Types other than white pine are shown as nearly as possible as 
they occur, without, however, pacing out distances or spending too 
much time in getting unessential details, such as crooks, bends and 
general irregularities of outline. 
A list of the owners of white pine of merchantable size and 
of large blocks of thrifty reproduction is obtained as the mapping 
proceeds, and any abundant crop of Ribes, either wild or cultivated, 
is noted in connection with the mapping; but no extra time is 
devoted by the map men to getting this information. If it is 
deemed necessary or advisable another man will be sent over the 
areas mapped to get statistics and additional information in the 
nature of a census. 
The mapping is done by townships, and one township is to be 
completed before starting on the next. 
