Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

590 Molesworth’s pocket-book Decimal Equivalents of Inches, Feet, and Yards. Fractions Decims. Decims, of an of an -g^ndg. of an Inch. Inch. Inch. i — i - i- •0625 •125 • 1875 2 •25 ' •3125 •375 •4375 •5 ■5625 ■625 •6875 •76 •8125 •875 •9375 1-00 <j 1 = -03125 3 = ’09375 ° S = •15625 " 7 = -21875 9 = -28125 11 = -3437Ö 13 = •40625 15= '46875 17 = -53125 19 = *59375 21 = -65625 23 = 71875 25 = 78125 27 = • 84375 29 = ‘9Ö625 31 = -96875 Inches. Feet. Yards. 1 — •0833 = '0278 2 = •1667 = -0556 3 = •25 = '0833 4 = •3333 = '1111 5 — •4167 = -1389 6 = •5 = -1667 1 = •5833 = -1944 8 = •6667 = -2222 9 = ■75 = -25 10 = •8333 = -2778 11 = •9167 = -3056 12 — 1 •000 = -3333 Timber Measuring. G = |th girt of tree at middle in feet. g — J th girt of tree at one end in feet. g' = |th girt of tree at the other end in feet. L = Length-of log in feet. c == Cube contents of log in feet. Allowance is to be made for bark by deducting from each. |th girt. The allowance varies from half an inch in trees with thin bark to 2 inches for trees with thick bark. Measures of Timber. 100 superficial feet of planking .. = 1 square. 120 deals .. .................=1 hundred 50 cube feet of squared timber ,. = 1 load. 40 feet of unhewn timber ,, .. = 1 load. 600 superficial ft. of inch planking = 1 load. Boards 7 inches wide .............= battens. „ 9 „ — deals. „12 „• = planks.