SELLINGLUMBER 441 



Standard Specifications for Southern 



Yellow Pine Bridge and 



Trestle Timbers 



(To be applied to Single Sticks and not to Composite Members) 



For Use in Railway Structures 



The use of Southern Yellow Pine for bridge and trestle 

 timbers in railroad work requires high grade pieces of timber 

 both as to strength and lasting 'power. Recognizing these 

 facts, a special set of standard specifications has been adopted 

 by the. Southern Pine Association. The specifications as to 

 the quality of the timber are according to the Standard Speci- 

 fications adopted and copyrighted by the American Society 

 for Testing Materials defining dense and sound pine.f These 

 terms replace the botanical designation hitherto used, that is, 

 longleaf, shortleaf and loblolly pine. The grade "dense" pine 

 refers to the strongest pieces of what has hitherto been known 

 as longleaf pine. 



The specifications as to grades are the Standard Specifi- 

 cations for Southern Yellow Pine bridge" and trestle timbers 

 adopted and published in the Manual by the American Railway 

 Engineering Association (reprinted by permission of the Ameri- 

 can Railway Engineering Association from, the Manual, 1916). 

 The only change which has been made in the reprint of the 

 American Railway Engineering Association rules is that "dense" 

 pine has been substituted for longleaf pine and "sound" pine 

 for shortleaf pine. 



BRANDED TIMBERS. 



Proper service to buyers and users of yellow pine timber 

 demands correct grading, and the branding or marking of 

 each stick of timber showing its grade. 



Variation in the individual character of different pieces of 

 timber is responsible for the difference in strength. Structurally, 

 some are much stronger than others. 



fAdopted and copyrighted by the American Society for 

 Testing Materials, August, 1915. 



