﻿DECAYS AND DISCOLORATION.? IN AIRPLANE WOODS. 



Page. 

 Pine, southern yellow : Blue- 

 stain, sapwood 28 



sugar : Blue-stain, sapwood- 29 



Brown-stain, sapwood 24 



Dirt streaks 16 



Kiln burn 24 



Pink heartwood 15 



Orange-red stain : 24 



western white : Blue-stain 28 



western yellow : Red-brown 



rot, heartwood 35 



Red-rot, heartwood 34 



white : Blue-stain, sapwood- 29 

 Brown to black blotches, 



tool burns 17 



Dirt streaks 16 



Pink heartwood 15 



Redwood : Brown-rot, heart- 

 wood 36 



Spruce : Compression failure 

 caused by — 



Faulty assembly 18 



Felling 11 



Spruce: Compression failure 

 caused by — Continued. 



Steam bending 



Testing 



Spruce: Compression wood 



Pitch pockets 



Spruce, Himalayan: Red heart- 

 wood 



Spruce, red : Red-rot, heart- 

 wood 



Spruce, Sitka : Blue-stain, sap- 

 wood 



Decay during shipment 



Reddish brown-purple color, 



lightning 



Reddish brown rot, heart- 

 wood 



Red heartwood 



Red-rot, heartwood 



Red-stain, sapwood 



Spruce, white : Red-rot, heart- 

 wood 



51 



Pace. 

 10 



n 



9 



12 



16 



34 



28 

 31 



19 



35 

 16 

 34 



28 



