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Both the 1690 and the 1690 CCS are available in four configurations, from 30 to 42 feet. With 24 to 34 15-inch rows these air drills are ideal for 15-inch beans and milo. Each model folds easily into transport position, with 8.5 inches of road clearance to get over the rough spots.Got major ground to plant this spring? It''s all in a day''s work for these new drills. Stop by your John Deere dealer to find out more.Special features: 1690 Soybean Special Like the 1890, the 1890 CCS uses our 90 Series Openers and active hydraulic system. But the 1890 CCS also features our new Central Commodity System to carry up to 100 bushels of seed on board the drill, so you don''t have to pull a seed cart. The unique CCS metering system sends seed straight to the openers for superior control over seed population rates. And both the 1890 and the 1890 CCS are available with 7.5/15-inch or 10/20-inch spacing, and in four widths from 30 to 42 feet. If you''re making a separate trip across your fields just to put down fertilizer, then we''ve got a machine that could save you over $6 per acre: the new 1895 Separate Fertilizer Placement Tool. With the 1895, you can plant and fertilize in one pass, without worrying about burned seed.

The author then takes the first of a number of ruminative breathers, speculating on the button. The Romans used buttons only as ornaments and even the ancient Chinese never progressed beyond the toggle and loop. Unlike the handsaw, which was refined over time, the button and its buttonhole simply appeared in northern Europe in the thirteenth century--true works of an anonymous inventive genius. Then we proceed to an influential treatise on ingenious machines published in 1588 by Agostino Ramelli, a military engineer. Among the machines build is a bookstand that revolves like a Ferris wheel, holding eight books at a constant angle by means of a gearing system used in astronomical clocks. The author comments: "Of course, gravity would have done the job equally well (as it does in a Ferris wheel), but the gearing system allowed Ramelli to demonstrate his considerable skill as a mathematician." Then the author writes: "This splendid folly distracts me-I''m supposed to be looking for screwdrivers."