I* a 9" proportional width 



|i min . prop, width j 



Sample center axis, defining the sample locus 

 Boundary of 1/2 sq..ft. rectangular sample 

 Boundary of 1/4 sq. ft. rectangular sample 

 Boundary of 1/10 sq. ft. rectangular sample 

 Boundary of proportional sample. 



Figure l.--The relative placement of the various sample units, 

 showing the method of nesting. Scale: 6" = 1'. 



2 



