Plate 28.—Arrangement of a wall more than 8 feet high without making loopholes.
Plate 28a.—Arrangement of an iron fence built on a low wall.
CHAPTER VI
Revetments
A revetment is a covering or facing placed upon an earth slope to enable it to stand at an inclination greater than it would naturally assume. Some revetments also increase the tenacity of slopes and diminish the injury by fire. The upper parts of revetments that may be struck by projectiles which penetrate the cover of earth must not be made of materials of large units which will splinter when struck. The upper part of the revetments is technically known as crowning.