Plate 37.—Methods of use of gabion.
Gabion Revetment.—The use of gabions in revetment is illustrated in Plate 37. If more than two tiers are used, the separating fascines should be anchored back. Gabion revetment should be crowned with sod or sandbag.
The advantages of gabion revetment are very great. It can be put in place without extra labor, faster and with less exposure than any other. It is self-supporting and gives cover from view and partial cover from fire quicker than any other form. Several forms of gabions made of material other than brush have been used. Some of them are sheet iron, empty barrels and hoops. The disadvantages of iron are that it splinters badly, is heavy, and has not given satisfaction. If any special materials are supplied, the methods of using them will, in view of the foregoing explanation, be obvious.
Timber or Pole Revetment.—Poles too large for use in any other way may be cut to length and stood on end to form a revetment. The lower end should be in a small trench and have a waling piece in front of them. There must also be a waling piece or cap at or near the top, anchored back. Plate 38 shows this form.
Miscellaneous Revetments.—Any receptacles for earth which will make a stable, compact pile, such as boxes, baskets, cans, etc., may be used for a revetment. Canvas or burlap stretched behind pickets is being used to a great extent on the battle fronts of Europe. If the soil will make adobe, an excellent revetment may be made of them, but it will not stand wet weather.
Plate 38.—Timber revetment.