A Text book of Topographical Drawing

Cover A Text book of Topographical Drawing
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Goirsu I^TITUDB Length of Course X0O8 Bearing LOKOITUDB Length of Coarse X sin Bearing Total Lat Total Lon.
AB - 324.72 + 1019.30 + 390.91 1828.17 BC - 711.68 - 456.30 - 320.77 1371.87 CD - 393.21 + 278.76 - 713.98 1650.63 DE - 346.14 - 1051.82 - 1059.12 598.81 EF + 1059.12 - 598.81 0.00 0.00 FA + 715.63 + 808.87 + 715.63 808.87 To make the final plot two axes are drawn accurately perpendicular to each other, corre- sponding to NS and FG of Fig. 24 ; the vertices of the polygon are then fixed b
...y using the distances in the last two columns as coordinates ; A, for instance, being 715.63 feet above FG and 808.87 feet to the right of NS. The minus signs attached to some total latitudes now indicate simply that they lie below FG.
Any other point than F might have been chosen through which to draw the axes. If £ had been thus used, all the total latitudes would have been plus, while some total longitudes would have been plus, and some minus.
44. Surveys based on a System of Coordinates. In extended surveys the area is often divided into squares whose sides may be from 50 feet to several hundred feet in length 36 PLOTTING according to the magnitude of the work.


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