SELLINGLUMBER 461 



Southern Yellow Pine Timbers 



Including Definition of the "Density Rule" 



Authorized Reprint from the Copyrighted Standards of the 

 American Society for Testing Materials 



Approved and Adopted by the Southern Pine Association, New Orleans, La. 



March 15, 1916 



SOUTHERN YELLOW PINE TIMBER GRADES. 



The grades of timbers are as follows: 



* Page 



Heart Timbers ; 465 



No. 1 Common Timbers 465 



Square Edge and Sound Timbers 466 



Merchantable Timbers 466 



Select Structural Material 467 



PREFACE. 



It has been recognized for a good many years by both 

 the manufacturers and consumers of Southern Yellow Pine 

 that a constructive and simple method for classifying various 

 classes of Southern Yellow Pine for structural purposes would 

 find wide application and fill a long required need. The three 

 botanical species of yellow pine, namely, long leaf, short leaf 

 and loblolly, frequently intergrade, so far as their density is 

 concerned, and much misunderstanding has resulted from time 

 to time because of the lack of a practical method for determin- 

 ing whether any particular class of yellow pine was adapted 

 for the purpose intended. Realizing this condition, the South- 

 ern Pine Association has actively co-operated with the United 

 States Forest Service and the American Society for Testing Ma- 

 terials for the purpose of finding some such method for dis- 

 tinguishing the various classes of pine for structural purposes. 

 The American Society for Testing Materials made a preliminary 

 suggestion for grading the Southern pines in their report for 

 1909. The rule proposed was based on the number of rings 

 per inch. This rule was widely used, but was found too indefi- 

 nite for final adoption. 



As a result of careful study of many trees of all species 

 a method has been devised during the past year by the United 



