A complete treatise on practical land-surveying, in seven parts; . 625 1252 523 CL B 639 636 Begin at A. Range W. on the left. BaseLine or Per. on the right. Diag. • Area 9a. 1r. 30 £ p. E 3 54 LAND-SURVEYING (Part III. 5. Required the plan and area of a field, from the followingdimensions. A D Diag. 1744 545 1365 546 B. egin at A. Range E. Area 10a. 1r. 30p. >. Lay down a field, and find its area from the following notes. D B 1095 488 L. off D. AD 1358 B .532 410 Be^in at A. Diag. 298 C. Side. Ranee E, Answer. Double Triangle A B Triangle area ,5a. Or.
A complete treatise on practical land-surveying, in seven parts; . 625 1252 523 CL B 639 636 Begin at A. Range W. on the left. BaseLine or Per. on the right. Diag. • Area 9a. 1r. 30 £ p. E 3 54 LAND-SURVEYING (Part III. 5. Required the plan and area of a field, from the followingdimensions. A D Diag. 1744 545 1365 546 B. egin at A. Range E. Area 10a. 1r. 30p. >. Lay down a field, and find its area from the following notes. D B 1095 488 L. off D. AD 1358 B .532 410 Be^in at A. Diag. 298 C. Side. Ranee E, Answer. Double Triangle A B Triangle area ,5a. Or. 39p. ANOTHER METHOD. A field of four sides may sometimes be surveyed by dividingit into two right-angled triangles, and a trapezoid. TO COMPUTE THE CONTENT. Rule.—Multiply the sum of the two perpendiculars by theirdistance upon the base-line, and the product will be double thearea of the trapezoid. The area of each triangle must be foundas before. Part 111.) LAND-SURVEYING. 55 EXAMPLES. 1. It is required to survey the annexed figure, and find its area. C. Measure the base A D, and enter in your field-book wherethe two perpendiculars rise, &c. as in the following notes. Triangle ABE. 422 per. 265 base. j 1 ADr: 1326 G C = 645 AG= 952 IE B = 422 AE= 265 i Per. Base. 21102532844 111830 Triangle base. 258045151935_ 241230 Trapezoid E B C \645|Per- 1067 base. 746985366402__ 733029 E 4 56 LAND-SURVEYING. (Part III. 733029 Double areas 111- collected. 2)108( 8 i L72i76 2^ i. lR. 29p. 2. Required the plan and area of a field, from the foil notes. AB 1 z -1 E 1015 • 1 D. G 132 705 C. Begin at A. Range W. Frr. on the left. Base. Per. on the right. Area 7a. Or. 1:p. 3. Lay down a field, and find its area, from the following dimensions. AB E. C SS3 G. Begin at A. Rang- E Area Sa PROBLEM V. FIELD* COMPREHENDED UXDER MORE THANFOUR STRAIGHT SIDES. Avy piece of land, consisting of more than four sides, mayhe surveyed by reducing it into triangles a
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