352 RESEARCH METHODS 



longer tapes, it is best to use a somewhat greater \vidth and 

 thickness. 



The first perforation of each boundary tape is 5 centimeters 

 from the end of the strap, as shown in the sketch, the diameter 

 being 5 milHmeters, a size large enough to permit the insertion 

 of an ordinary surveying pin. The boundary tapes are of such 



(^ 





BOUNDARY STRAP- A 



lTll3-meters- 



DIVISrON STRAP-B 



'%^^ 



n-^ 



M- 



BOUNDARY PLOT AND DIVISION TAPES OF SPECIAL DESIGN ADAPTED 

 TO THE MAPPING OF PASTURE VEGETATION. 



a length that there is no overlapping of the tape itself upon the 

 meter-square area, a space that is disregarded in mapping when 

 the originally designed tapes are used. Accordingly, the dis- 

 tance between the first and the second perforation is 1.065 

 decimeters. At each succeeding decimeter a similar perforation 

 appears, marking off a total of exactly 10 decimeters on each 

 side. To facilitate mapping, each decimeter space carries a 

 number plainly stamped midway between each two decimeter 

 division marks. 



The two division straps labeled " B " are 9 millimeters wide 

 and 1.033 meters long. These tapes also are marked off into 

 decimeter lengths, and the intervals are numbered to corre- 

 spond with the markings on the boundary tapes. Both bound- 

 ary and division tapes are made of flexible, noncorrosive, non- 

 reflecting steel or other substantial material whose contraction 

 and expansion is slight. In addition to the matter of meas- 

 uring off an exact unit area, these tapes have an advantage over 

 those ordinarily used in that there is an extension of 5 centimeters 

 from the last perforation to the end of the boundary tape. This 



