CHECK ESTIMATING 



309 



methods employed was the location of corners with the aid of a guide, the use of a 

 map and the sketching of the boundaries of areas of different types by intersection, 

 aided by rough triangulation from known points. Cardinal directions for strips were 

 not attempted in any instance. This tract was afterwards estimated by the strip 

 method, running 5 per cent of the area. The comparison of the two methods and 



Estimate of Taylor' 



TABLE XLVI 



Creek Logging Unit, Blooming Grove Tract, 

 County, Pa., 1911 



A. By extensive methods, in two days' time, one man with guide. . 



B. By 4-rod strip, 5 per cent of area, diameters cahpered, average heights. 



Pike 



Type 



Area. 



Acres 



Method of cruising 



employed under 



A 



Estimate. 



Error by First 

 Method 



Amount 



M feet 



B.M. 



Per cent 



Pitch pine, 

 pure stands 



scattered on 

 burns 



White oak and 

 hardwoods 



Swamps with 

 hardwood 

 and conifers 



375 



1275 



200 



450 



Pitch pine j-acre circular plots 

 for sizes 

 8-rodrectangularplots 

 coimted, when con- 

 venient 



Pitch pine 16-rod strip counted, 

 when convenient 



White oak Total count of large 

 trees 

 Average trees guessed 

 at 



Spruce [j-acre circular plots, 

 selected by guess for 

 average stand per 

 acre 



Hemlock 



36 



1.7 



-197 



+353 



- 47 



+ 88 



Total . 



2300 



Yellow 



poplar 

 Ash 



White 

 pine 



Some poplar counted 



Treetops counted 

 from hiU. Average 

 tree guessed at 



Uniform old growth 



+223 + 42 

 +161 I +181 

 - 25 - 20 



32 



11.3 



A 4526 +526 i + 10.9 

 B 4079 i i 



