sitka spruce: uses, growth, management. 



37 



Table 16. — Average diameter outside hark at 15 feet above ground of Sitka 

 spruce on all sites in different parts of Oregon and Washington — Continued. 



Age. 



Tsiltcoos. 



Newport. 



Clatsop. 



Ray- 

 mond. 



Hoquiam. 



Beaver. 



Average. 





Diameter in inches outside bark at 15 feet. 



Years — Continued . 

 310 





53.8 



54.8 

 55.7 

 56.7 

 57.5 



51.4 

 52.4 

 53.5 

 .54.5 



60.5 

 61.7 

 62.8 

 64.0 

 65.1 



66.2 

 67. 3 

 68.4 

 69.6 



54.4 

 55.8 

 57.2 

 58.6 

 60.0 



61.4 

 62.8 





55.3 



320 







56.6 



330 







57.8 



340 







59.0 



350 







60.2 



360 









61.4 



370 











62.5 



380 











63.6 



390 













64.7 



400.. 













65.8 



410. . 















67.2 





















95 



78 

 1 



100 



133 



73 



78 



557 











Table 17. — Results of tests on Sitka spruce wood from Washington, in green 

 and air-dry condition, in the form of small clear pieces. 1 



[From Table 1, U. S. Dept. Agr. Bull. 556.] 



Mechanical property. 



Green 

 condi- 

 tion. 



Air-dry 

 condi- 

 tion. 



Number of rings per inch 



9 



24 

 53 

 .37 

 33 



4.5 



7.4 



3,000 



5,500 



1,180 



6.4 



2,600 



330 

 780 

 230 



370 



9 





24 





8.9 





.38 





26 



Shrinkage from green to oven-dry condition: 



Radial (per cent) 









Static tending: 



7,200 





11, 200 





1,610 





10.4 



Compression parallel to grain: 



5,770 



Compression perpendicular to grain: 



1,010 



Shearing strength parallel to grain (pounds per square inch) 



1,210 







Hardness, side: 



Load required to embed 0.444-inch ball to one-half Its diameter (pounds) 



530 



1 Te3t specimens were 2 inches by 2"Inches in section. Bending specimens were cut 30 inches long; others 

 were shorter, depending on test. 

 • Work to maximum load represents the shock-absorbing ability of the wood. 



LUMBER GRADES. 



The following lumber grades are in use for different Sitka spruce 

 products : H 



Finish: B and Better. Partition: B and Better. 



flooring: B and Better. Bevel siding: A, B, O. 



Ceiling: 15 and Better. Wagon-box sets : B and Better. 



Stepping: J5 and Better. Boards and strips: Selected Common, 

 Battens: B and Better. No. 1 Common. 



11 For further information, nee Went Const Lumberman's AHBOciation, " Itulo 2 : Stand- 

 ard Clarification, QradlBg, and DreMing Rubs for Doaglai Fir, Sitka Spruce, Cedar, 

 and W'-hC-rn Hemlock Products," January 22, \'.VZ2. 



