=Note.=--_The method of using the aim-teacher, aim-corrector, and aiming disc, and grouping gauges is described in the Appendix. Aiming- and firing-rests are described in “Musketry Regulations,” Part II._ (ii) =Aiming Marks.=--(i) The aiming marks to be used in aiming instruction will consist of elementary bull’s-eye targets for the early stage of instruction, and of a variety of figure targets similar to those used for firing practices for later stages. (ii) When the habit of accuracy has been acquired in aiming at elementary targets, service targets will only be used and care will be taken that there is no falling off in accuracy owing to the shape and comparative invisibility of these targets. A list of figures for use on miniature ranges will be found in the Appendix, VII, para. 5. Section =16=.--Aiming Instruction. =1. Rules for Aiming.=--The instructor will explain the following rules, and demonstrate the results to be anticipated from common errors in aiming: (i) The backsight must be kept upright. (ii) The left or right eye, according to the shoulder from which the man shoots, must be closed.[10] (iii) Aim must be taken by aligning the sights on the centre of the lowest part of the mark, the top of the foresight being in the centre of, and in line with, the shoulders of the =U= or =V= of the backsight (Fig. 11). [Illustration: =Fig. 11.=--DIAGRAMS SHOWING CORRECT AND INCORRECT ALIGNMENT OF SIGHTS.] _Note._--The low point of aim is essential in firing at service targets, as it facilitates a clear view of marks which are usually difficult to discern, and also because service targets are frequently in movement towards the firer, thus necessitating aiming down to alter elevation owing to their decreasing distance. =2. Method of Instruction.=--(i) When these principles have been mastered, the instructor will loosen the sling of the rifle, adjust the sights for any given range, and aim from a rest at the target, taking care that _his eye is immediately above the butt-plate_. It will be convenient to use a sandbag aiming-rest to steady the head during the aiming. (ii) Having aimed, he will make each recruit observe the correct method of aligning the sights on a mark. Each recruit in turn will then be made to align the sights on a mark, after which the instructor will verify his aim, point out errors, and explain how they would have affected the accuracy of the shot, and how they are to be avoided. For example, Fig. 11 shows incorrect sighting, the rifle being inclined to the right, aimed to the right, and aimed too low, the top of the foresight being well below and to one side of, instead of in the centre of and in line with, the shoulders of the =U= of the backsight. The obvious result of these errors would be to fire low to the right of the mark. [Illustration: =Fig. 12.=--LONG-RANGE SIGHTS.]