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 



TABLE XLVI 



Estimate of Taylor's Creek Logging Unit, Blooming Grove Tract, Pike 



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 calipered, average heights. 



Type 



Area. 



Acres 



Species 



Method of cruising 

 employed under 



A 



Estimate. 



M feet 

 B.M. 



Error by First 

 Method 



Amount 



M feet 



B.M. 



Per cent 



Pitch pine, 

 pure stands 



scattered on 

 burns 



White oak and 

 hardwoods 



Swamps with 

 hardwoo d 

 and conifers 



375 



1275 



200 



450 



Pitch pine 



Pitch pine 



White oak 



Spruce 



Hemlock 



Yellow 



poplar 

 Ash 



White 

 pine 



i-acre circular plots 

 for sizes 



8-rodrectangularplots 

 counted, when con- 

 venient 



16-rod strip counted, 

 when convenient 



Total count of large 



trees 

 Average trees guessed 



at 



J-acre circular plots, 

 selected by guess for 

 average stand per 

 acre 



Some poplar counted 



Treetops counted 

 from hill. Average 

 tree guessed at 



Uniform old growth 



A 2178 

 B2214 



- 36 



1.7 



A 248 

 B 445 



A 750 

 B 397 



A 750 

 B 527 



250 

 89 



100 



A 



B 



A 



B 125 



A 250 



B 282 



-197 



+353 



+223 

 +161 



- 25 



- 32 



- 47 



+ 88 



+ 42 

 +181 



- 20 



- 11.3 



Total. 



2300 



A 4526 

 B4079 



+526 



+ 10.9 



