Manual of military engineering . Plan of j*ir Courses Plan of^&tt Courses Stbdks to cccrrytap soTLdba^s. S ECTION ler& Urho,LondonOpprtsitje jtctgfi>3S. CHAPTER IX.~ EARTHWORKS^ 35 earth. The size of the openings must be governed by theground to be covered by fire,* and can best be regulated bytesting with a rifle with the bolt removed to ensure thatneither line of sight nor line of fire are obstructed. Sandbag loopholes, as shown in PI. 18, Figs. 3 and 4, can be Sandbagmade in a continuous line as close as 3 feet 3 inches from loophole,centre to centre. Sandbags sag a good deal unl
Manual of military engineering . Plan of j*ir Courses Plan of^&tt Courses Stbdks to cccrrytap soTLdba^s. S ECTION ler& Urho,LondonOpprtsitje jtctgfi>3S. CHAPTER IX.~ EARTHWORKS^ 35 earth. The size of the openings must be governed by theground to be covered by fire,* and can best be regulated bytesting with a rifle with the bolt removed to ensure thatneither line of sight nor line of fire are obstructed. Sandbag loopholes, as shown in PI. 18, Figs. 3 and 4, can be Sandbagmade in a continuous line as close as 3 feet 3 inches from loophole,centre to centre. Sandbags sag a good deal unless well supported. Loopholes made with earth or sandbags may have the largeropening either inside or outside. If the larger opening beinside, the loophole is very much less conspicuous, which isoften a point of great importance. If the larger opening be outside, a defender can fire with muchgreater ease, since he can cover the whole arc without movinghis position. The choice must depend upon the requirements of the place. A compromise between the two above methods is shown in , PI. 19, Fig. 1.
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