. The Forest products laboratory : a decennial record, 1910-1920. ortance in connection with aircraft design wasevident. As this investigation proceeded, the possibilities in thestructural use of this material became greater and greater, and thenew knowledge was applied as quickly as possible. Mention hasalready been made of the new type of wing rib, a large part of thesuccess of which depends upon the efficient use of plywood of the progress made in wing beam design likewise was due tothe application of the new data to the design of these important parts. Several large elevator spar
. The Forest products laboratory : a decennial record, 1910-1920. ortance in connection with aircraft design wasevident. As this investigation proceeded, the possibilities in thestructural use of this material became greater and greater, and thenew knowledge was applied as quickly as possible. Mention hasalready been made of the new type of wing rib, a large part of thesuccess of which depends upon the efficient use of plywood of the progress made in wing beam design likewise was due tothe application of the new data to the design of these important parts. Several large elevator spars were designed for Xavy flying boats,and in the progress of the test an entirely new type of constructionwas perfected. The use of spirally or diagonally wound veneer overthe core provided very high resistance to torsional stresses with ex-tremely low weight. The net result was a very strong and stiff sparwith the minimum weight. A new engine bearer was designed for the De Haviland bearer is of plywood about an inch thick, cut out of the solid sheet. LAMIXATED CONSTRUCTION AS APPLIED TO WOODEN ARTICLES OF COMMERCEWagon Bolster Hat Blocks Baseball Bats Shoe Lasts A Dkckxxiai, Kfaoui) 1-.) and lightened as nmeli as p().ssil)le tln-ougli tlie nse of liglitening proper selection of species and thicknesses of piles resnlted in anappreciable increase of strength without increase in weight. Similarparts were designed for several Xavy planes. ^Nluch attention was devoted to the nse of thin plywood as a wingcovering and a nnniher of tests were made in the hope of de\eloping asatisfactory linen substitute. Several types of construction were triedout. and interesting preliminary results secured. Xo covering oi- ty])eof construction was ])erfeete(l. however, which was superior to thestandard wood and linen type. Development of Glues Closely associated with most of the aircraft proldems upon whichthe laboratory worked was the all-important one of glue
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