In most branches of the army a knowledge of map reading and mapping methods is necessary, and in the artillery it is essential. Not only must the artillery officer be conversant with the interpretation of maps, military and topographic, but he must have knowledge and skill in making sketches and in locating positions by traverses, intersection, and resection. Much of this work is of a reconnaissance nature, with a considerable allowable error, but where it involves the locating of batteries and battery commander stations for use upon firing maps, the locations must be accurately made. These locations are preferably made by intersection, simple resection, or by Italian resection2 or other three-point methods which give a high degree of accuracy. For all such purposes the plane-table is the most satisfactory instrument and the geologist is particularly adapted to render such instruction.

For the purpose of instructing artillery students and officer candidates . . .

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