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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 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."

movers--four riding CTA 3612; Rotary Table--Emsco T-3750.DERRICK: Emsco/MH1157''; 1,333 kips.BOP SYSTEM: 10,000 psi.CRANES: Two 20 t.MOORING: Four x 20t.REMARKS: Formerly Hakuryu VI.WORK AREA: Bohai Bay.China Offshore OilSouthern Drilling Co. (COSDC)NAN lawn HAI NO. 1RIG DESIGN: ETA/Robin Loh; Robray-300CONSTRUCTION: Robin Loh, Singapore, 1976. Upgraded 1999.PERFORMANCE: Water depth--165''; Drilling depth--20,000''.QUARTERS: 100 persons.HULL: mowers 213'' x 212'' x 27''.VARIABLE LOAD: 1,688 mt.HELIPORT: 75'' diameter, S-61.