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The book continues forward through ever more precise lathes, backward to the screw press of the ancient Greeks, and backward even further to the water screw invented to raise water by Archimedes (c. 287- 212 B.c.), also a military engineer. The author comments that it is "as far as we know, the first appearance in human history of the helix," and the screw, like the spiral staircase, is a helix. The author continues: "The discovery of the screw represents a kind of miracle. Only a mathematical genius like Archimedes could have described the geometry of the helix in the first place, and only a mechanical genius like him could have conceived a practical application for this unusual shape."
Other books in the series: Farm Appliances * Farm Blacksmithing * Farm Conveniences * Farm Machinery * Farm Motors * Fences, Gates and Bridges * Handy Farm Devices * Harris on the Pig * The Homestead Builder * Shelters, Shacks, and Shanties * Village and Country ResidencesThe Lyons Press has put out an extensive series of reprints of practical books in the spirit of the Foxfire books. Like them, this series of classics comes from the source of old-timey know-how. The books present immense detail and practical and complete references, particularly since most in the series (which includes fourteen titles) were intended as textbooks. The original texts were first published between 1880 and 1937, but the bulk of the information is as applicable today as it was a hundred years ago.
The drivetrains of the three machines feature ZF axles. The heavy-duty rear axle features self-adjusting, oil immersed hydraulic inboard brakes, differential lock and final drives. Optional all-wheel drive (AWD) is engaged by a front console panel switch. The system can be engaged on the go, under load in any gear in forward or reverse. The system features outboard planetary gear final drives. The service brakes work with a three-position brake mode switch. The operator can select two-wheel drive and braking, two-wheel drive and all-wheel braking, or all-wheel drive and braking. The AWD and 2WD front axles are pendulum mounted and permanently sealed and lubricated requiring no daily maintenance. The front axle features a double acting steering cylinder with 50[degrees] steering angle for increased maneuverability. Axle oscillation is 11[degrees] in each direction from centerline.
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