=3. Judging Lateral Distance by Eye.=--The following is a rough guide for judging lateral distances running at right angles to the observer at various distances. With one eye shut and the hand at arm’s length to the front with the fingers perpendicular, the breadth of six fingers will cover 100 yards of lateral distance at a distance of 500 yards from the observer. Under the same conditions, the breadth of three fingers will cover a lateral distance of 100 yards at a distance of 1,000 yards. The breadth of two fingers will cover a lateral distance of 100 yards at 1,500 yards, and the width of the thumb will roughly cover 100 yards of lateral distance 2,000 yards away. This method may be employed for estimating the approximate length of an enemy’s column, or the extent of frontage known to be occupied by him. =4. Method of Instruction=--(i) =Units of Distance.=--All the methods mentioned in para. 1 should be practised by officers, N.C.O.’s, and men under a variety of practical conditions, and in the prone, kneeling, and standing positions, until it is found that distances can be judged approximately from the general impression conveyed to the eye. The class will first be familiarized with short units of distance not exceeding 600 yards. _Special care will be taken to enable soldiers to recognize the distance of 600 yards, as it is the limit of individual fire._ (ii) =Figures.=--The class will at the same time study the visibility of the figure standing, kneeling, and lying at known distances. They will be required to remember the results of their observation, and be given opportunities of seeing figures in varying conditions of light, atmosphere, and background at known distances. (iii) =Features of Ground.=--The class will next be practised in judging the distance of natural features of ground, such as folds of ground, hedges, patches of undergrowth, and other forms of cover, at various known distances. This instruction will be followed by judging the distances of fatigue-men seen at unknown distances in the different firing positions both in the open against various backgrounds and partly behind cover. The class will then be practised in judging the distance of features of ground and different forms of cover at various unknown distances. These various practices should be carried out with the class in the standing, kneeling, and prone positions.