con- siderable number of tests. As a means of judging whether the glue is being used to the best advantage, the shear block test is very valuable. The specimens can be prepared from almost any piece of glued work, provided the laminations are not thinner than about one-fourth of an inch and the… … 3 Fig. 3.—Plywood specimens and method of test. PLYWOOD SHEAR TEST. An additional strength test is made on glues used for the manufacture of plywood. This consists of shearing the plies apart. The form of specimen used at the Forest Products Labora- tory is the one used during the war by the…
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