(_It is suggested that this page be removed by cutting through the above line, and selected portions of the Sectional Data Slips attached to the back of the Slide Rule._) ¹⁄₃₂ │0·03125 ¹⁄₁₆ │0·0625 ³⁄₃₂ │0·09375 ⅛ │0·125 ⁵⁄₃₂ │0·15625 ³⁄₁₆ │0·1875 ⁷⁄₃₂ │0·21875 ¼ │0·25 ⁹⁄₃₂ │0·28125 ⁵⁄₁₆ │0·3125 ¹¹⁄₃₂ │0·34375 ⅜ │0·375 ¹³⁄₃₂ │0·40625 ⁷⁄₁₆ │0·4375 ¹⁵⁄₃₂ │0·46875 ¹⁷⁄₃₂ │0·53125 ⁹⁄₁₆ │0·5625 ¹⁹⁄₃₂ │0·59375 ⅝ │0·625 ²¹⁄₃₂ │0·65625 ¹¹⁄₁₆ │0·6875 ²³⁄₃₂ │0·71875 ¾ │0·75 ²⁵⁄₃₂ │0·78125 ¹³⁄₁₆ │0·8125 ²⁷⁄₃₂ │0·84375 ⅞ │0·875 ²⁹⁄₃₂ │0·90625 ¹⁵⁄₁₆ │0·9375 ³¹⁄₃₂ │0·96875 Circ. of circle = 3·1416 _d_. Area „ „ = 0·7854 _d_^2. Sq. eq. area to cir., _s_ = 0·886 _d_. Circle eq. to sq., _d_ = 1·128 _s_. Sq. inscbd. in circ., _s_ = 0·707 _d_. Circsb. circ. of sq., _d_ = 1·414 _s_. Area of ellipse = 0.7854 _a_ × _b_. Surface of sphere = 3·1416 _d_^2. Volume „ „ = 0·5236 _d_^3. „ „ cone = 0·2618 _d_^2 _h_. Radian = (180°)/(π) = 57·29 deg. Base of nat. or hyp. log. = e = 2·7183. Nat. or hyp. log. = com. log. × 2·3026. g (at London) 32·18 ft. per sec., per sec. Abs. temp. = deg. F. + 461° = deg. C. + 274°. C.° = (5)/(9)(F.° − 32°); F.° = (9)/(5)C.° + 32°. Cal. pr.—Ther. units per lb.: Coal, 14,300; petrol’m, 20,000; coal gas per cu. ft., 700. Sp. heat:—Wt. iron, 0·1138; C.I., 0·1298; copper, brass, 0·095; lead, 0·0314. Inch = 25·4 mil’metres; mil’metre = 0·03937 in. Foot = 0·3048 metres; metre = 3·2809 feet. Yard = 0·91438 metre; metre = 1·0936 yards. Mile = 1·6093 kilomtrs.; kilomtr. = 0·6213 mile. Sq. in. = 6·4513 sq. cm.; sq. cm. = 0·155 sq. in. Sq. ft. = 9·29 sq. decmtr.; sq. decmtr. = 0·1076 sq. ft. Sq. yd. = 0·836 sq. metre; sq. metre = 1·196 sq. yds. Sq. ml. = 258·9 hectares; hectare = 0·00386 sq. ml. Cu. in. = 16·386 c. cm.; c. cm. = 0·06102 cu. in. Cu. ft. = 0·0283 c. metre; c. metre = 35·316 cu. ft. Grain = 0·0648 gramme; gram. = 15·43 grs. Ounce = 28·35 grams.; „ = 0·03527 oz. Pound = 0·4536 kilogm.; kilogm. = 2·204 lb. Ton = 1·016 tonnes; tonne = 0·9842 ton.