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Agricola on Metals
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Heralds of Science
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Moving the Obelisks:
Dating from the beginning of historical memory, the obelisks of ancient Egypt—those tall, tapering shafts typically weighing from 200 to 500 tons—were carved from a single block of solid stone to commemorate the ruler of the moment. Many of these ancient monoliths, taken from Egypt as trophies of conquest and symbols of power through the efforts of extraordinary human labor and engineering ingenuity, were re-established in the capitals and seats of empire that also inherited Egypt’s burden of civilization. While near the climax of their historical potency, obelisks were erected by Alexandria, Nineveh, Constantinople, Rome, Paris, London, New York, etc. Fascinating as obelisks are as tr...
Moving the Obelisks
A Chapter In Engineering History In Which The Vatican Obelisk In Rome In 1586 Was Moved By Muscle Power, And A Study Of More Recent Similar Moves.
Moving the Obelisks
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Stronger Than a Hundred Men
Like many apparently simple devices, the vertical water wheel has been around for so long that it is taken for granted. Yet this "picturesque artifact" was for centuries man's primary mechanical source of power and was the foundation upon which mills and other industries developed. Stronger than a Hundred Men explores the development of the vertical water wheel from its invention in ancient times through its eventual demise as a source of power during the Industrial Revolution. Spanning more than 2000 years, Terry Reynolds's account follows the progression of this labor-saving device from Asia to the Middle East, Europe, and America-covering the evolution of the water wheel itself, the development of dams and reservoirs, and the applications of water power.
