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18 MOLESWORTH'»» POCKKT-BOOK
Strength and Weight of Materials—continued.
Timber—eontinu&l.
Specific Gravity. Weight of a cubic foot. 2.2 Tensile Strength per aq. in. Crushing Strain per aq. in. h
• 1 lbs. lbs. lbs. | lbs. 11«.
Elm, English ., .. •553 34 *02 13,200 10,300 782
■579 36 *021 14,000 — 1100
Canadian •725 45 •026 — 1 — 1920
Fir, spruce .. .. •512 32 •018 10,100 6,5001490
Hornbeam .. .. •76 47 •027 20,000 4,600 — ,
Ironwood .. .. 1-15 71 •041 — — 30Qfl
Jackwood .. .. •67 42 •024 —- —— 183(
Larch •543 34 •019 8,9001 3,200 133C 5,5<0 1660
•556 35 •02 10,200
, Lignum vitæ .. .. 1-333 83 •048 11,800 10,000 3440
Lime .. •564 35 •02 —
Mahogany, Nassau •668 42 •024 1719
„ Honduras •560 35 •02 21,ÜÜ0 8,000 1910
_ Spanish •852 53 :o3i 8,200 1300
Maple ,. ... •675 42 •025 10,600 —• 1694
Oak, African .. .. •988 62 •035 2523
„ American, red •85 53 •03 10,000 6,000 16«<J
„ ,, white •779 49 •028 — —— 1600
„ Englibh .. .. •777 48 •028 10,000 6,400
•934 5» •034 19,000 10,600 1690
Pine, red .. .. •576 36 •021 12,000 5,400 1200
•657 41 •024 14,000 7,500 1530
„ white .. .. •432 27 •015 —— 1229
•553 34 •02 —— — ——
„ yellow .. .. •508 32 •018 5,300 1185
„ Dantzic .. .. •649 40 •023 «,000 5,400 1426
„ Memel .. .. ■550 34 •02 — 1348
•601 37 •021 — •— ——
„ Elga .. .. •466 29 •017 —— —— —
•654 41 , -023 14,000 — 1383
Satinwood .. .. •96 60 . -034 I - — 3200
1 Teak •74 46 •026 8,000 12,000 2110
•86 54 I *031 ;15,000 —
Note.—The transverse strength is the coefficient K in the formula for
strength of rectangular beams, but in lbs. The modulus of rupture may
be found by multiplying the transverse strength by 6.