Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

20 Molesworth’s pocket-book Strength and Weight of Materials—continued. Miscellaneous Substances. Specific Gravity. Weight of a cubic foot. Weight of a cubic inch. Tensile Strength per eq iu. Crushing Strain per sq. in. Asphalte 2-5 lbs. 156 lbs. •09 lbs. lbs. Brick, common from 1-6 100 •057 —— „ „ • • t0 2 125 •072 —-• —— „ London stock .. 1-84 115 •066 — •— „ red 2-16 134 •077 — 808 „ Welsh fire.. .. 2-4 150 •086 —— ■*— „ Stourbridge fire 2-2 137 •079 1717 Cement, Portland, from 1-6 100 ■046 400 3795 „ .. to 1-76 110 •05 600 5984 ,, Roman .. .. 1-6 100 •057 185 •— Clay 1-9 119 •068 —— •—- Coal, anthracite .. .. 1-53 95 •055 —• „ cannel.. .» .. 1‘272 J9 •046 —— —— „ Glasgow .. .. 1-29 80 •046 . — — „ Newcastle .. .. 1-269 79 •045 •— •— Coke .. ■744 46 •026 —— — Concrete, ordinary .. 1-9 119 •068 —— . -V— ,, in cement .. 2-2 137 •079 —• Earth .. .. from 1-52 11 •054 •— *— „ .... .. to- 2-OU 125 •072 —— •— Glass, flint 3-07» 192 •111 2413 27,500 „ crown .. .. 2-52 157 •091 2546 31,000 „ common green.. 2-528 158 •091 2896 31,876 ,, plate 2-76 172 •099 —• —— Gutta-percha .. .. •966 60 •035 — Gypsum 2-286 143 •082 71 — India-rubber .. .. •93 58 •033 —• —— Ivory 1'82 114 •065 •— — Lime, quick •843 53 •03 — — Mortar .. .. from .. 1'38 86 •049 — — 1, • • • • 11) • • 1-9 119 •068 •— — .. average |l*t 106 ■061 — Pitch .. .. .. .. 1’15 69 •041 —- — Plumbago 2-261 , 140 •082 — — Sand, quartz .. .. 2-75 171 •099 — —— „ river •• •• jl-88 1 117 •067 — —