28 



BULLETIN 67, U, S. DEPARTMENT OF AGRICULTURE. 



Table 7. — Results of pole tests made by the Pacific Telephone & Telegraph Co. — Contd. 



PORT ORFORD CEDAR. 





Length. 



Number 

 of poles 

 tested. 



Average values of— 



Top di- 

 ameter. 



Weight 

 of poles. 



Weight 



per cubic 



foot. 



Moisj 

 ture. 



Rings 

 per inch. 



Sap. 



Top load 

 at failure. 



Modulus 

 of rup- 

 ture. 



Inches. 

 6 



Feet. 

 .25 

 25 

 25 

 30 

 30 

 30 

 35 

 35 



3 

 3 

 4 

 3 

 3 

 3 

 3 

 3 



Pounds. 

 256 

 315 

 460 

 375 

 397 

 441 

 585 

 591 



Pounds. 

 31.3 

 24.8 

 26.6 

 24.3 

 25.2 

 24.0 

 30.4 

 28.1 



Per cent. 

 11.6 

 10.7 

 13.3 



8.6 

 20.5 



9.6 

 10.1 



9.7 



16.3 

 25.6 

 10.3 

 15.3 

 15.0 

 14.7 

 9.0 

 21.0 



Per cent. 



Pounds. 

 2,027 

 3,277 

 3,740 

 2,518 

 2,790 

 3,577 

 3,123 

 3,057 



Lbs. per 

 sq. m. 

 7,616 



7,896 

 6 058 



7 





8 





6 





6,817 



7 





7,332 

 7,824 

 6,851 



8 





7 





8 





6,928 







Table 8. — Relation between top diameters and top breaking loads. 

 [Pacific Telephone & Telegraph Co.'s tests.] 





Top di- 

 ameter. 



AVestem red cedar 

 from Idaho. 



Western red cedar 



from Oregon and 



Washington. 



Port Orford cedar. 



Length of poles. 



Number 

 of poles. 



Average 



top 



breaking 



load. 



Number 

 of poles. 



Average 



top 



breaking 



load. 



Number 

 of poles. 



Average 



top 



breaking 



load. 



25 and 30 feet . 



Inches. 

 6 

 7 

 8 

 9 



7 

 11 

 9 

 3 



Pounds. 

 1,703 

 2,139 

 2,511 

 2,992 



6 

 9 

 9 

 3 



Pounds. 

 1,411 

 1,645 

 2,115 

 3,257 



6 

 9 

 11 



Pounds. 

 2,272 

 3,063 

 3,169 



25, 30, and 35 feet 



25, 30, and 35 feet 



35 feet 











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