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THE ELEVATOR
The wall is built of earth and stone, faced
with brick in the eastern parts. It is from 4.6 to 9.1 m
(15 to 30 ft) thick at the base (about 6 m/20 ft on the average)
and tapers to some 3.7 m (12 ft) at the top. The height averages
7.6 m (25 ft) exclusive of the crenelated parapets. Watchtowers
about 12 m (40 ft) in height are placed at intervals of approximately
180 m (approximately 200 yd).

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