. Karakoram and western Himalaya 1909, an account of the expedition of H. R. H. Prince Luigi Amadeo of Savoy, duke of the Abruzzi. a very long operation when there is a large numberof points to be located. When the stations and all the points intersected by them have been put onpaper, we proceed to the determination of the secondary points, or detail, all 384 Ai)|)endix A. chosen beforehand for the purpose of the draft. After the various elements ofthe panoramic views have been corrected, a selection is made from them (takingthem two by two, at contiguous stations) of points useful to the surv
. Karakoram and western Himalaya 1909, an account of the expedition of H. R. H. Prince Luigi Amadeo of Savoy, duke of the Abruzzi. a very long operation when there is a large numberof points to be located. When the stations and all the points intersected by them have been put onpaper, we proceed to the determination of the secondary points, or detail, all 384 Ai)|)endix A. chosen beforehand for the purpose of the draft. After the various elements ofthe panoramic views have been corrected, a selection is made from them (takingthem two by two, at contiguous stations) of points useful to the survey ; eitherfor the purpose of tracing contours, or for determining the lie of various ridges,the direction of streams, the limits of glaciers, bases of rocks, &c. The operationis regulated for the number of points chosen according to the scale that is desired,the precision required, and the time at the disposition of the operator. All thesepoints have been registered in the notebook, according to the station from whichthey were taken, and marked on the relative panoramic ^^ews with numbers orletters written in red \ PAGASrNI DRAFTING INSTRUMENTS USED IN CONSTRUCTING THE MAP. The tracing on the design of all directions to these secondary points used tobe a very long and monotonous operation and far from accurate. The modernprocess is quick and simple, thanks to a special drafting instrument based upon theformula (1) c^uoted above, and called the grajjhical .sector for the directions tosecondary points of the perspective. By its means the horizontal projection ofeach perspective is traced successively upon the design, carefully orientated, withits i^rincipal point at the effective distance from the station point, in such a waythat, by transferring with the compass the abscissae of the various points takenon the siews to a scale cut on a metal ruler, the corresponding horizontal directionsmay be easily drawn by means of a movable plate (or alidad) furnished with a metalruler
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Keywords: ., bookauthorsavoialu, bookcentury1900, bookdecade1910, bookyear1912
