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allow anthracene average bordered pits butt rot butt treated cat faces cell cavities cell walls Class B Pole creosote oil decay defect deﬁnite diameter dimensions distance durable eﬂicient exceed factor of safety feet ﬁbers ﬁfteen foot mark foot poles forations fungus Gibbs Company GIBBS COMPANYŚMILWAUKEE ground line growth heartwood immersion inch circumference inches inches inches inches longer inches Reject Reject knots length load MAC-GILLIS 86 GIBBS MacGillis and Gibbs medullary rays minimum Modulus of Rupture moisture Northern White Cedar Penetration Process penetration results perforated pole perforating machine perforating process Pole 20 pole timber pole treated poles containing pound-feet proper radial walls Red Cedar Poles rots which enter sapwood seasoned Shaved Poles shows speciﬁc gravity springwood strength suﬂiciently summerwood surface sweep tangential temperature Thuya tion top sizes tracheids treated pole treatment untreated Western Red Cedar White Cedar Poles WISCONSIN