A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 407
kept in line by the use of the instrument shown in Fig. Ill, PartI. In Fig. 557 the two positions of the boat at the ends of theline are determined by the trilinear method. 831. Systems of Lines for Soundings. When great accuracy is desired, besides the lines at right angles to the shore other… … 39G MARITIME OR nYDROGRAPIIIC SFRVEYIXO. run, either at right angles 16 the first lines, dividing the territoryinto squares, or crossing the first lines obliquely. This gives anopportunity to check the accuracy of the work by noting the dif-ferences of the soundings where the lines cross. On the…
Surveying
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