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192 pages, Paperback
First published January 1, 1975
East of Monte Cassino, at Venafro on the Volturno, a Roman water mill has been unearthed with a wheel 7 feel in diameter. If the millstones made 46 revolutions per minute, they could grind 150 kilograms (roughly 1 ½ tons) in 10 hours. To see the extraordinary economy in manpower achieved by such a mill, it is only necessary to compare these figures with the quantity of corn ground by two slaves with a rotary hand-mill in one hour: 7 kilograms, or 70 kilograms in 10 hours. So over 40 slaves would have to work 10 hours to grind the same 1500 kilograms. (p. 8-9)
In the years 1315-17 Europe was devastated by a hideous famine; in 1337 the Hundred Years� War began, and in the same year occurred the first bankruptcy that shook the European economy. Some ten years later, in 1347-50, Europe was decimated by the worst catastrophe Western civilization has suffered, the Black Death, and before the end of the century, in the years 1378-82, conditions led to a series of revolutionary uprisings throughout the continent. (p. 199)