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, &cIllustrated by four hundred engravings, and a magnetic chart . CA DE. Then is AB = C Measure AC X DECD • If more convenient, measure CD in tkecontrary du-ection from the river, as in , instead of towards it, and in other re-spects proceed as before. (203) By parallels. Let AB be the in-accessible distance. From any point, as C,range out a parallel to AB, as in Art. (165),&c. Fmd the distance CA,
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, &cIllustrated by four hundred engravings, and a magnetic chart . CA DE. Then is AB = C Measure AC X DECD • If more convenient, measure CD in tkecontrary du-ection from the river, as in , instead of towards it, and in other re-spects proceed as before. (203) By parallels. Let AB be the in-accessible distance. From any point, as C,range out a parallel to AB, as in Art. (165),&c. Fmd the distance CA, by Art. (191),&c. Set a stake at the point E, the inter-section of CA and DB, and measure X (AC — CE) Fig. 137. Then is AB CE Fig. 139. (204) By a parallelogram. Set a stake at any convenient pouit C. ^ Set stakes D and E, anywhere in ~ the alinements CA and CB. WithD as a centre, and a length of thechain equal to CE, describe an arc ;and with E as a centre, and a lengthof the chain equal to CD, describe another arc, intersecting thefonner one at F. A parallelogram, CDEF, wUl thus be stakes at G and H, where the alinements DB and EA inter-sect the sides of this parallelogram. Measure CD, DF, GF, FH,
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectsurveying, bookyear18
