. The Forest products laboratory : a decennial record, 1910-1920. ir Serviceas Avell as much of that used by the Xavy Air Service Mas inspectedand certified by him and his assistants. Attention was then directed to the great desirability of usingwater-resistant glue in aircraft construction, not alone on account ofexposure to the weather when in service, but also because of the severeconditions during shipment and storage. It had been known for manyyears that so-called water-proof glues could be made from bloodalbumin and from casein, and various secret formulas had been devel-oped and were in
. The Forest products laboratory : a decennial record, 1910-1920. ir Serviceas Avell as much of that used by the Xavy Air Service Mas inspectedand certified by him and his assistants. Attention was then directed to the great desirability of usingwater-resistant glue in aircraft construction, not alone on account ofexposure to the weather when in service, but also because of the severeconditions during shipment and storage. It had been known for manyyears that so-called water-proof glues could be made from bloodalbumin and from casein, and various secret formulas had been devel-oped and were in use to a certain extent. In fact, it is well establishedthat the enemy was using casein glue in his aircraft before our entranceinto the war. In this country there were se^eral small manufactiu-ersof waterproof plywood glued with blood albinnin. However, therewas not available for general use an appreciable amount of a suitablewater-resistant glue, for either plywood or joint Mork, Therefore,the perfection of several ty])es of water-resistant glues was immedi-. GLUE SPREADJXG MACHINE—A STEP IX THE MAKING OF PLYWOOD A Decennial Kecoud 47 iitely undertaken. A special staff of chemists and assistants wasgathered together, and the necessary ecjuipnient installed. Tliis ^ irtii-ally marks the lahoratorys entrance into glue research. Within a reasonahle time, higli class glues of })oth types. ])loo(lalbumin and casein, had been worked out and made available to theBureau of Aircraft Production, llegular inspection and test of sam-ples of plywood glued at various plants had })een established early inthe study and was maintained as an aid to tlie manufacturers in mak-ing a satisfactory product. Assistance was rendered them, also, bytrips of inspection and study at the individual plants. In addition tothe glues already mentioned, a special kind of blood albumin gluetissue was invented. This is particularly adapted to the gluing of verythin plywood, such as that used in the experiments
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