International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 139
ezoid E C D Gis equal to the product ofthe latitude E G oi thethird course by its longi-tude N O, a soiitJi product.The area of the triangleA G D is equal to the prod-uct of the latitude ^-i G of the fourth course by its longi-tude P Q, SL north product. Subtracting the sum of thenorth products… … Fig. 324 1337. The Application of Double Longitudes tothe Finding of Arecis.—Whatever the number or direc-tions of the sides of a field or any surface enclosed bystraight lines, its area will always be equal to half the dif-ference of the north and south products arising from multi-plying together…
Railroad engineering
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