. Handbook of the Southern Nigeria Survey and text book of topographical surveying in tropical Africa. Fig. with Proportional Compass. Note AF s/iould be 5 times AFbut for the sake of clearness has not been drawn m this proportion 92 9383 Similar!} for the rcmaiiulcr of tlic path. Note.—If AF = 5 x AF, there is no need to adjust the compass asdescribed in III., but to set it at \ in the usual way. It is generally necessary to bisect AF, and sometimes to divide itinto more than two equal parts, as the proportional ccjmpass is notbig enough to span more than about 6 inches and the tra
. Handbook of the Southern Nigeria Survey and text book of topographical surveying in tropical Africa. Fig. with Proportional Compass. Note AF s/iould be 5 times AFbut for the sake of clearness has not been drawn m this proportion 92 9383 Similar!} for the rcmaiiulcr of tlic path. Note.—If AF = 5 x AF, there is no need to adjust the compass asdescribed in III., but to set it at \ in the usual way. It is generally necessary to bisect AF, and sometimes to divide itinto more than two equal parts, as the proportional ccjmpass is notbig enough to span more than about 6 inches and the traverse maybe 20 inches long. Too much precision should not be aimed at in the reduction of thedetail, especially in rope traverses. An) error is safel}- localised byfixing the salient points, road junctions, stream crossings, etc.,accurately and putting the remaining detail in by eye. (d) If no pantagraph or proportional compass is the line A—F to be 2 miles and A—F to be also 2 miles. Act as in (c), but instead of the proportional compass use theI : I2,5C0 scale for measuring the various details on AF in feet, andtr
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Keywords: ., bookcentury1900, bookdecade1910, bookidhandbookofso, bookyear1911
