Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 246
single spar—1^ inches wide, and f inches thick—and at least 4 feetlong, and be bolted fast to the spar with six ^ inchround-head carriage bolts with washers of large bear-ing surface (that is, a small hole to fit the bolt, and a THE GLIDER. 245 large outer diameter) at both ends of the bolt, to…
Aeronautics
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
