THE MEASUREMENT OF PIECE PRODUCTS 



469 



Poles having tops of the required dimensions must have sound tops. Poles 

 having tops one (1) inch or more above the requirements in circumference may have 

 one (1) pipe rot not more than one-half (j) inch in diameter. Poles with double 

 tops or double hearts shall be free from rot where the two parts or hearts join. 



No poles containing ring rot (rot in the form of a complete or partial ring) shall 

 be accepted under these specifications. Poles having hollow hearts may be accepted 

 under the conditions shown in the following table: 



Scattered rot, unless it is near the outside of the pole, may be estimated as being 

 the same as heart rot of equal area. 



Poles with cup shakes (checks in the form of rings) which also have heart or star 

 checks may be considered as equal to poles having hollow hearts of the average 

 diameter of the cup shakes. 



Western Red Cedar forms the main source of supply of poles in the West. The 

 specifications for these poles permit a much smaller taper than for Eastern timber 

 since the tree form is more cylindrical. 



The specifications (American Telephone and Telegraph Company) are given 

 in Table LXX, p. 470. 



For Southern Yellow Pine poles for creosoting, the required dimensions are 

 given in Table LXXI, p. 471. 



Chestnut has been a standard pole timber but is rapidly disappearing in Eastern 

 states because of the ravages of the chestnut blight. The specifications differ only 

 slightly from those for white cedar, and are as follows: 



Dimensions. Length. Poles shall not be over six (6) inches shorter or twenty- 

 four (24) inches longer than the length specified in the order. 



Circumference. Poles shall be classified with respect to their circumferences at 

 six (6) feet above the butt and at their top in accordance with Table LXXII, p. 

 472. This table gives the minimum allowable circumference at six (6) feet above 

 the butt and at the top for poles of each class and length listed and shall not preclude 

 the acceptance of poles having greater circumferences at those points of measure- 

 ment than those given in the table. 



