The book Military Topography And Photography was written by author Floyd D Carlock Here you can read free online of Military Topography And Photography book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Military Topography And Photography a good or bad book?
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Schniffer's Method. It is usually better to orient the picture trace by the tangent method explained above, but it may occasionally be desirable to use the method explained in this section. Procedure: (1) Draw radials from s through the plotted points a, b and c (Fig. 39) ; (2) at a convenient point aj on the radial sa, draw a line parallel with radial sc ; (3) upon this line lay off distances ajbi and bxC! equal respectively to the horizontal distances of the images of A and B and B and C on t...he negative; (4) at bi and c^ draw lines parallel with radial sa, producing them so as to intersect radials sb and sc, respectively, and then through these intersections draw a line hh* this line is parallel w r ith the desired position of the picture trace ; (5) on line hh 1 lay off distances hb 2 and b 2 c l equal respec- tively to ajbi and b^, and through points b 2 and c 2, draw parallels to radials sa intersecting the radials sb and sc respec- tively at b 1 and c 1 ; (6) through b 1 and c 1 draw a line inter- secting the radial sa at a 1 ; this line a^c 1 is the required posi- tion of the picture trace.
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