109 



which the group to be selected will depenfl upon the class of structure desired and the 



load for which it is designed; 



GROUP "A" 



Lengths Minimum Diameter Minimum Diameter 



Butts Tips 



Up to 40' inclusive 12" 8" 



50' to 64' inclusive l.V 8' 



65' to 74' inclusive 14" 8" 



75' to 100' inclusive 15" 7" 



101' and up 16" 7" 



CROIF "B" 



Up to 60' inclusive 14" 0" 



61' to 80' inclusive 15" 8" 



81' to 100' inclusive 16" 8" 



101' and up 17" 7" 



No piling with butt diameter greater than twenty-two (22) inches will be accepted 

 unless otherwise stipulated. In determining the diameter of a pile not having a circular 

 cross section, the average of the mininuim and maximum measurements at that cross 

 section shall be taken. 



Air Skasoned Pit. inc. 



Piling stored on land and air seasoned shall in all particulars meet the foregoing 

 specifications for green, freshh' cut and water stored piling. Piling stored on land for 

 air seasoning nuist be piled on skids or other supports such as to keep the piling at 

 least ten (10) inches abo\-c the ground, and each layer of piling shall be separated 

 from the others b>- strips not less than three (,^) inches in thickness, in order to permit 

 a free circulation of air. Piling stored in this manner will be considered thoroughly air 

 seasoned when its moisture content, based on the o\en dry weight, has been reduced 

 to twenty (20) per cent. 



Air seasoned jiiling with checks of such size as will impair the strength and dura- 

 bility of the piling will not he accepted, regardless of the fact that such checking has 

 taken place naturally. 



Sawed Lumber and Timber 

 quality and grade 



The purchaser shcdl specify commercial grade desired according to Grading 

 Rules standard or currently recognized in the production and marketing of the species 

 of timber or lumber in\'olved; the material so to grade after treatment. The standard 

 commercial grade usually specified for creosoting purposes is that known as Select 

 Common Douglas fir, in accordance with Domestic List No. 7, edition of 1917, pub- 

 lished by the Pacific Lumber Inspection Bureau, Inc. The American Lumber Stand- 

 ards, recently formulated by the industry in cooperation with the Government, will 

 doubtless govern in the future. The American Standard grade nearest equivalent to 

 the former select common is designated No. 1 Common. 



I>RE1\\R.\TI0N FOR TREATMENT 



Selecting Material for Loading Cylinder Charges 

 sawed lumber and timber 



Care must be taken to secure material of approximately the same moisture content 

 for the same cylinder charge; that is, green or freshly cut lumber and timber must not 

 be mixed with seasoned or partially seasoned material. 



