Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

17 OF ENGINEEBING FORMULÆ. Strength and Weight of Matebials—continued. Alloys—continued. Sj>ecific Gravity. Weight of a cubic foot. Weight of a cubic inch. Tensile Strength per sq. in. Crushing Weight per sq. in. Transverse Strength. Brass, 5 copper, 1 zinc lbs. lbs. 8-41 525-09 •3 13-7 >, 4 „ 1 „ 8-448 527-36 •304 14-7 .... —- ,, 3 „ 1 M 8-397 524-18 •3 13-1 . .. 2 „ 1 „ 8'299 518-06 •299 12-5 . » 1 » 1 >> ■ 8-23 513'75 •296 9’2 - „ 1 »> 2 „ 8’283 517-06 ■298 19-3 7-371 460’13 •265 1’9 - - - Gold (standard) .. 17-724 1106*42 •638 Gun-metal, 10 cop-) per, 1 tiu .. .. 5 8’561 534-42 •308 16-1 —— I’itto, 9 tiu, 1 copper 8-462 528-24 •304 15-2 __ Ditto, 8 „ 1 „ 8-459 528*05 •304 17-7 - Ditto, 7 „ 1 „ 8-728 544-85 •314 13-6 Pewter —. Silver (standard) .. 10-312 643-72 •3?1 — — Speculum metal .. 7-447 464-8? •264 3-1 White metal (Babbelt) 7-31 456’32 •263 - - Timber. Acacia .. from lbs. lbs. lbs. lbs. •71 44 •025 16,000 1867 » .. to •79 49 •028 Ash ’69 43 •025 12,000 8,600 2000 Beech .. from •76 47 •027 17,000 9,300 3000 •69 43 •025 11,000 7,700 1500 . .. to •696 43 •025 22,000 9,300 2000 Birch •711 44 •026 15,000 3,300 1900 Box •730 ,45 •026 6,000 1930 1’28 80 *046 20.000.10,300 2445 ■ Cedar, West Indian •748 •47 •026 5,000 5,700 1443 „ American .. •554 35 •020 • 766 Lebanon .. Chestnut •486 30 •on 11,000 5,800 131)0 •606 38 •022 12,000 __— 1770 Cork r .. •240 16 •008 - Deal, Christiana .. •689 43 ‘025 12,000 5,850 1562 Ebony 1’187 74 •043 ~ 1 19,000 21UÜ 0