The object of the tests here described was to determine the strengths of comparatively slender wood struts, and to find, if possible, the most suitable kind of wood to use for struts in aeroplanes, having regard to strength and lightness.

The samples of wood were kindly supplied by Messrs. Wm. Mallinson and Co., Hackney Road, London, N.E.

Each strut tested was of uniform cross section throughout its length, the section being rectangular, about two inches wide and about one inch thick. Seven of the struts were about 32 inches long, one was about 30 inches long, and the remaining fifteen were 24 inches long. The exact dimensions are given in Table I.