CHAPTER VII.

MATERIALS FOR AEROPLANE CONSTRUCTION.

§ 1. The choice strictly limited. § 2. Bamboo. § 3. Ash--spruce-- whitewood--poplar. § 4. Steel. § 5. Umbrella section steel. § 6. Steel wire. § 7. Silk. § 8. Aluminium and magnalium. § 9. Alloys. § 10. Sheet ebonite--Vulcanized fibre--Sheet celluloid--Mica 86