Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

78 MOLESWORTH’S POCKET-BOOK Eaethwobk Tables. (General De Lisle, R.E.) Half Cutting, Half Bank. Express the ratios of hill slope and back cutting or bank slope in terms of , let the . height difference of these ratios for cutting = c, for bank , . , , area bank ~ o, and let-----------— r. area cutting Then if ~ is less than unity, its value taken as argument for Table VII. gives Kc, a factor which multiplied by the whole width of the road gives the width for cutting. But if ~ is greater than unity, its reciprocal as argument in Table VII. gives Kft, a factor which, multiplied by the whole width of the road, gives the width for bank. When r = 1, that is, when cutting and bank are b c to be equal, the arguments are - or - respectively. Examples, Let width of road = 20 feet, bank r = ------— = 1-2. cutting