. Railway mechanical engineer . Modulus of Rupture- lb. Specific 639 Per Cent 55 Rings per inch 10 Modulus of Rupture 10,750 lb. Specific Gravity 598 Per Cent 52 Rings per inch 23. Modulus of Ruptui- i,(.f,0 lb. Modiiluwf ;,tuie 5,520 lb. Specific Gravity 432 .Specific Gravity 440 Per Cent Summerwood Per Cent 25 Rings per inch 32 Rings per inch 10 The two upper blocks show typical sections of timber with a large per-centage of summerwood, lloth have high density or .specific gravity and ahigh modulus of rupture, although the rings per
. Railway mechanical engineer . Modulus of Rupture- lb. Specific 639 Per Cent 55 Rings per inch 10 Modulus of Rupture 10,750 lb. Specific Gravity 598 Per Cent 52 Rings per inch 23. Modulus of Ruptui- i,(.f,0 lb. Modiiluwf ;,tuie 5,520 lb. Specific Gravity 432 .Specific Gravity 440 Per Cent Summerwood Per Cent 25 Rings per inch 32 Rings per inch 10 The two upper blocks show typical sections of timber with a large per-centage of summerwood, lloth have high density or .specific gravity and ahigh modulus of rupture, although the rings per inch vary greatly. Thetwo lower blocks show a small percentage of summerwood. The specificgravity is low in both cases and the modulus of rupture shows the ultimatestrength is only about one-half as great as for the dense wood. The testswere conducted on small, ^r specimens of green material. F(g. 1—Samples Illustrating the Properties of Yellow Pine percentage of failure was found were the pieces that fall inthe low part of the curve. The pieces which brought thecar to the shop were in very rare instances the pieces thatwere in the high points of the curve. A third series of tests was made to determine whet
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
