SUGAS PIJSTE. 



19 



seasoned. Heavy thick boards cut from the sapwood are especially 

 subject to brown stain, while heartwood boards seldom stain except 

 under the "stickers," 



Table 13 gives the results secured from piles at a representative 

 mill in the central Sierras, elevation 2,500 feet. These results 

 should be considered simply as illustrations of what has occurred 

 under certain specific conditions. The study has not yet progressed 

 far enough to allow of general conclusions. 



At this mill all sugar pine is air seasoned. The No. 3 shop and 

 better is cut principally 6/4 in thickness, although 4/4, 5/4, 8/4, and 

 10/4 material is manufactured. Depreciation increases with the 

 thickness of the lumber. 



The piles of No. 3 shop and better were put up with three 2 by 4 by 

 16 inch rough-dry white-fir stickers and three 8-inch chimneys. The 

 pile foundations had a slope of 1 inch to the foot. Piles were roofed 

 and sun covere were used on highest grade material. 



Table 13.- 



-Depreeiation in various grades of sugar-jmie lumber during air seasoning at 

 a mill in the central Sierras, California. 



Original grade and 

 tMckness. 



Length of time in pile. 



Total 



contents 



pile. 



Amount 

 lowered 

 in grade. 



Value 

 loss. 



1, 2, and 3 clear— 8/4. . . 

 1, 2, and 3 clear— 6/4. . . 



No. Ishon— 6/4 



No. 1 shop— 6/4 



No. 1 shop— 8/4 



No. 2 shop— 6/4 



No. 2 shop— 6/4 



No. 2 shop— 6/4 



Aug. 5, 1914, to Oct. 14, 1914. 

 July 14, 1914, to Oct. 14, 1914. 

 May 31, 1914, to Oct. 13, 1914. 

 May 1, 1914, to Oct. 10. 1914. . 

 Aug. 20, 1914, to Oct. 10, 1914 

 July 24, 1913, to Jiuie 13, 1914 

 Oct. 30, 1913, to Oct. 1, 1914.. 

 Apr. 28, 1914, to Oct. 1, 1914. 



Feetb.in. 



10, 244 

 4,371 

 5,334 

 4,582 



27, 606 

 4,842 



16, 585 

 6,733 



Feet b. VI. 



2,086 



75 



51 



7 



810 



260 



207 



3.71 

 .37 

 .10 



.30 

 .42 

 .10 



The summer depreciation at this mill in connection with air 

 seasoning of sugar pine appears to be about $1.90 per 1,000 feet for 

 Nos. 1, 2, and 3 clear, 15 cents for No. 1 shop, and 12 cents for No. 2 

 shop. In addition to this, it is estimated that about 1 per cent of the 

 material depreciates one grade during the winter. 



Upon the basis of this study, the following suggestions are offered 

 for decreasing loss through depreciation in grade during air seasoning. 



(1) Cut tliick stock (8/4 and thicker No. 2 shop and better) early 

 in the season so as to allow time for drying. 



(2) Clear away vegetation around piles. 



(3) Keep rear pile foundations far enough olT ground to allow of 

 good air circulation. 



(4) Provide a roof with 4-foot extensions front and roar for piles 

 of high-grade pine loft in yard over winter. 



(5) Provide sun covers during sninmer for pikw of liigh-gradc 

 material. 



(f)) Provide shed capacity for as much dry lumber as ])(».sil)le to 

 be held over winter. 



