132 A MANUAL FOR NORTHERN WOODSMEN 
Two miles per day are readily covered by two men, 
drawing topography carefully and estimating a good stand 
of timber. Not only has cruising work been done by this 
method, but control work as well, using more care and two 
instruments. This last use of the method requires making 
circuits several miles in length around either subdivisions of 
land or topographic areas. For cruising work the method 
is carried at farthest two miles to a tie point. Errors in 
direction and distance are seldom over \ chain per mile 
and the average error in height work is 10 feet. In very 
brushy country some tricks of the trade are introduced in 
the interest of speed, as sighting to the flash of a mirror or 
the metal note holder of the cruiser. In country of long 
