. Armour engineer. Jan. 1910] DEAN : A TOPOGRAPHICAL SURVEY 93 The draftsman and one helper were able to reduce about300 side shots per hour and to plot about 150 shots per houron the map. For the draftsman working alone, the time wasof course more than doubled. When the shots were all plotted, the property and fencelines, houses, barns, roads, railroad lines, etc., were drawn inwith the aid of the note books, sketches, and remarks, and thecontour lines of five-foot interval were sketched in. This workwas first penciled in detail, and later inked Fig. 5. On completion of the map, the area
. Armour engineer. Jan. 1910] DEAN : A TOPOGRAPHICAL SURVEY 93 The draftsman and one helper were able to reduce about300 side shots per hour and to plot about 150 shots per houron the map. For the draftsman working alone, the time wasof course more than doubled. When the shots were all plotted, the property and fencelines, houses, barns, roads, railroad lines, etc., were drawn inwith the aid of the note books, sketches, and remarks, and thecontour lines of five-foot interval were sketched in. This workwas first penciled in detail, and later inked Fig. 5. On completion of the map, the area of each parcel ofland lying between the flow line and the rivers edge was de-termined by going over the same three times with an accur-ately checked and adjusted planimeter, the mean of the threereadings being taken as correct. This method saved muchtime over the method of calculation of areas by latitudes and 94 THE ARMOUR ENGINEER [Vol. 2, No. 1 departures, and was quite accurate. The area of each contourline in the basin was similarly determined, and an accurateestimate of the storage capacity of the reservoir was madetherefrom. Tracings were made of the completed map withall land areas and storage capacities tabulated thereon, fromwhich blueprints were made Remarks: Before starting the survey, all instruments were carefullychecked for adjustment and accuracy of stadia wire correction was made in reducing the stadia notes for thestadia constant (f-)-c), the practice being for the instrument-man to read to the nea
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