Caption: War Publications - WWI Compilation 1923 - Article 46
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1! . > , ' not visible from gun; find range. i 1 11a. Frequent 1\ the |>osition of the target on the map is ktn>w:i ami theim-ihod indicated under la may be applied. lib. map cannot be determined for examt e >lane photography, trigonometric be applied as follows can from are visi from B Measure angles TAB and //AT. Then in &ABT any quantity can be determined, kilter the points G, A, B, T on the map and find range GT by measurement or by the Theorem of Pythagoras. It is of course assumed that the relative positions of A and of B to G are known. Other trigonometric methods are easily devised. In . • • t <:• method i. m DETERMINATION O F DIRECTION O F FIRING. III. Target visible from gun. OBI *i Usually the gun and target are not visible one from the other. When the target is visible from the gun, it is possible to sight directly, taking afterwards in aiming the gun the necessary corrections into account. This is called "direct firing" or "direct laying."* In this case only the range has to be determined which may be done by one of the methods explained. Another method consists in entering gun and target on the map and determining the direction of firing by means of map and compass. (! Dan ford Deflection IV. Taraet not visible f In this problem we may assume not only the range known but +Ua U » U „£ „ _ . . ~4.U„_ „-J i. . . . 1 . ! . 1. 1 _ _ C..\ ^~mr\Af>A at dedat segment (By be explained IVa. Battery gun BG c can be measured. Angle GBT is measured at B. In L.BGT angle opposite one side are known nn N I See Remarks, p. 39. 22
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