. Department bulletin. Agriculture; Agriculture. ————i———— I — UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 1128 Washington, D. C. PROFESSIONAL PAPER February 20,1923 DECAYS AND DISCOLORATIONS IN AIRPLANE WOODS By J. S. BOYCE, Pathologist Office of Investigations in Forest Pathology Bureau of Plant Industry CONTENTS Page Introduction 1 General Considerations 2 Woods Used for Airplane Construction 3 General Defects of Airplane Woods . 5 Color Comparisons 14 Discolorations Caused by Wounds . 17 Lightning Wounds 17 Sapsucker Wounds 20 Pith-Ray Flecks 20 Page Chemical Discolorations 23 Dis
. Department bulletin. Agriculture; Agriculture. ————i———— I — UNITED STATES DEPARTMENT OF AGRICULTURE BULLETIN No. 1128 Washington, D. C. PROFESSIONAL PAPER February 20,1923 DECAYS AND DISCOLORATIONS IN AIRPLANE WOODS By J. S. BOYCE, Pathologist Office of Investigations in Forest Pathology Bureau of Plant Industry CONTENTS Page Introduction 1 General Considerations 2 Woods Used for Airplane Construction 3 General Defects of Airplane Woods . 5 Color Comparisons 14 Discolorations Caused by Wounds . 17 Lightning Wounds 17 Sapsucker Wounds 20 Pith-Ray Flecks 20 Page Chemical Discolorations 23 Discolorations Caused by Fungi .... 24 Sap-Stain 25 Brown-Oak Discolorations .... 29 Decay Discolorations 30 Decay in Finished Airplanes 40 Summary 42 Literature Cited 45 Defects of Wood Referred to in This Bulletin, Arranged by Species .... 60. WASHINGTON GOVERNMENT PRINTING OFFICE 1923. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. Washington, D. C. The Dept. : Supt. of Docs. , G. P. O.
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