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OF ENGINEERING FORMULÆ.
Modulus of Elasticity.
E = Modulus of elasticity; 1 inch being the
unit of area.
M = Length corresponding -with modulus.
W = Weight each square inch will bear with-
out permanent alteration in length.
M. E. w.
feet. lbs. lbs.
Metals—
Brass 2,460.000 8,930,000 6,700
Gun-nietal .. .. 2,790,000 9,873,000 10,000
Iron, cast .. .. 5,750,000 18,4011,000 15,300
Iron, wrought .. 7,550,000 24,920,000 17,800
Lead 146,000 720,000 1,500
Steel .. from 8,530,000 29,000,000 45,000
to 12,354,000 42,000,000 65,000
Tin 1,453,000 4,60S,000 2,880
Zinc 4,480,000 13,680,000 5,700
Stones, &c.— Marble 2,150,000 2,520,000 4,900
Slate 13,240,000 15,800.000 ——
Portland 1,672,000 1,533,000 1,500
Timber—
Ash 4,970,000 1,640,000 3,796
Beech 4,600,000 1,345,000 3,113
Elm 5,680,000 1,340,000 3,102
Fir, red 8,330,000 2,016,000 4,667
Larch 4,415,000 1,074,000 2,486
Mahogany .. .. 6,570,000 1,596,000 3,694
Oak 4,730,000 1,700,000 3,935