Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 189
221. To cut out the stoutest rectangularbeam from a log. 1st case, divide the diameter in 3 equalparts, and draw lines at right-angles asrepresented. 2d, divide the diameter in 4 equal parts. 1, 5=1-414 6, non-elastic. 2, /z=l*73 6, elastic beams. 222. … D=4a Twisting in degrees = 425 FR I xD*
Mechanical engineering · Engineering
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