Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 26
t is illustrated in Fig. 3, it becomes appli- necessary merely to lay out two cable to the present case. For it is evi- figures ABCD and A'B'C'D', and find dent that if from any two points a and b, the intersection of the two diagonals on a right line, two pairs of lines be CD and CD'. This will be… … the line of sight. Move to A and sight is performed as follows. Select any to b and locate a part of Kb near where three points as A,B and C in the line pre- it seems to cross a line joining aC. Then viously located; set the instrument at sight to a and locate a part of Aa near B, and facing the…
Engineering
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