. Handbook of the Southern Nigeria Survey and text book of topographical surveying in tropical Africa. sistant and advance partytaking main bar in canoe (a) to station 15, which thexamp e 01 party has to select and clear. (B) Camp officer observing horizontal angle be-tween 13-12 and 13-14. (d) is his bf)at, (e) is the launch. (Cj, fCi), (C2) Second-class headmen taking intermediate bars topoint selected by camp officer, (b), (b), (b) are their canoes. Camp officer takes bearing and distance of these points, which are 141 187 188 then marked with banderoles (with white flags, or basket-tops pa
. Handbook of the Southern Nigeria Survey and text book of topographical surveying in tropical Africa. sistant and advance partytaking main bar in canoe (a) to station 15, which thexamp e 01 party has to select and clear. (B) Camp officer observing horizontal angle be-tween 13-12 and 13-14. (d) is his bf)at, (e) is the launch. (Cj, fCi), (C2) Second-class headmen taking intermediate bars topoint selected by camp officer, (b), (b), (b) are their canoes. Camp officer takes bearing and distance of these points, which are 141 187 188 then marked with banderoles (with white flags, or basket-tops paintedwhite), for the use of the plane-table parties. One of these intermediate points (C) should be placed so as togive the width of the river at the station and also to give a line forthe cross-soundings. If necessary, (C) can be instructed to go on after he has beenobserved and place himself at a fourth intermediate point, leavinghis banderole at (C). FIG. 16 Sketch showing disposition of RIVER FIELD CAMPjust after the subtense bar at Station 14 has beenobserved. _ For description see para- The most valuable places for intermediate points are sandbanks(C2), as these are usually visible from nearl} all points on bothbanks. The camp officer plots his auxiliary sheet before he leaves thestation. (D) Right-bank plane-table party surve}ing right bank. (E) Left-bank plane-table party surveying left bank. (f), (f) (f) are banderoles fixed by camp officer from station 12.(g), (g) are canoes of plane-table parties. (h), fh) are red flag banderoles interpolated by Party E, as in183, IV. 188. (a) In certain cases a theodolite traverse requires a certainamount of adjustment. For example, in para. 160 (c), it is men-tioned that the mean of the astronomical and traverseAdjusting latitudes and longitudes of ruling points are Theodolite ,, <. j Traverses usually accepted. Now suppose that a theodolite traverse runs froma fixed geographical point A to a point E, of which the latitude
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