Military topography for the mobile forces, including map reading, surveying and sketching - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ...still be able to keep up with the elevation of each point located and the important contour interpola For a statement of the details which should be located on a military map see par. 164. tions (see interpolation par. 167). If the rodmen are mounted the work will be much facilitated. 161. Radiation Method: Two rodmen may often be used to advantage as follows, figure 90: With the plane table in position at A, the observer directs rodman number 1 to the critical point B, as far from A as practicable, and draws a line toward B and reads the stadia, plotting the point at b and writing there its elevation. Rodman number 2, in the meantime, should have moved to the next critical point toward A from B as at C. He is lined in on A by rodman No. 1 and the horizontal distance and elevation of C are at once determined and recorded as above for B. Rodman No. 1 meantime should have moved to the next critical point toward A from C, or if there are no more such points in this line he moves over to a point in another line as at D from where the two rodmen move by alternate steps away from A toward the outer edge of the area. This system economizes the time of the observer in that he does not have a new direction to determine and a new ray to draw in for every critical point desired, so that he is able to keep up his plotting and contour interpolations as the work proceeds. The distance apart of the various radiating lines is to be deternained by the number of critical points necessary at their ends farthest from A. Each critical point from an instrument station should have a serial number which should be recorded in the notes as cpi cpi and on the sheets as 1, 2, 8, 4, 5, etc., so that any plotting can be subsequently checked up. This systematic method of choosing critica...
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