. Elements of military sketching and map reading . isible on theground can be identified on the map, turn the map so 28 ELEMENTS OF MILITARY SKETCHING that a line passing through them hes in the same direc-tion as the hne joining the points on the ground. When you have no compass for orienting your mapor sketch you may find the approximate true Northby the fohowing method, when the sun is shining:Point the hour hand of your watch toward the Hne drawn from the pivotal center of the dial mid-way between the hour hand and XII will point Southand a prolongation of this line in the opposite d
. Elements of military sketching and map reading . isible on theground can be identified on the map, turn the map so 28 ELEMENTS OF MILITARY SKETCHING that a line passing through them hes in the same direc-tion as the hne joining the points on the ground. When you have no compass for orienting your mapor sketch you may find the approximate true Northby the fohowing method, when the sun is shining:Point the hour hand of your watch toward the Hne drawn from the pivotal center of the dial mid-way between the hour hand and XII will point Southand a prolongation of this line in the opposite direc- <S KO / ^, ^/^ Fig. is. tion. To point the hour hand in the direction of thesun, hold a straw perpendicularly between the sun andthe watch and bring the hour hand in its shadow(Fig. 14). At night the approximate true north may be de-termined by the Great Dipper (Fig. 15). The NorthStar lies nearly in prolongation of a line of the twoouter stars of the bowl of the Dipper. Figure 17 illustrates that if the compass-needle and ORIENTATION 29. 30 ELEMENTS OF MILITARY SKETCHING
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