A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 188
the preced-ing expressions. We shall then have a GENERAL RULE FOR FINDING DOUBLE LONGITUDES. The Double Longitude of the first course is equal to its De-parture. . The Double Longitude of the second course is equal to theDmbU Longitude of the first course, plus the Departure of thatcourse, plus the… … s / i^ trU^-LJ^^ %^/ 182 COMPASS SURVEYOG. fPART in The Double Longitude of any course is equal to tlie DouhULongitude of the preceding course^ plus the Departure of thatcourse, plus the Departure of the course itself* The Double Longitude of the last course (as well as of the first)is equal to its…
Surveying
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