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I drifted off. The table had seen so many strange and sad There was a man in King City who had just stolen his grandma''s ''57 Chevy Impala to transport a harvest of dope, but first he had to stop by court to plead guilty to biting his wife. Then we spent a night talking to Victor, a shy Peruvian shepherd, whose land we camped on near Lost Hills. He told us that the black sheep always leads the pack because it walks faster, and that Orion''s belt is really called the Tres Marias. In Rosedale we were surrounded by junior high delinquents who kept disappearing to "yank" packs of Marlboros. In Twenty-nine Palms we met a Mexican jail runner who lived on earnings from cockroach races. T-bird, his favorite roach, never lost when beans and tortillas were at stake. At the Arizona-Sonora Desert Museum''s paleontology lab, the air scribe has become the workhorse of fossil preparation. The discovery of a large sauropod dinosaur in the highly indurated sandstones of the Mid-Cretaceous Turney Ranch Formation southeast of the museum posed numerous technical problems for our lab staff. Most troubling was the removal of vast amounts of sedimentary rock, which was both very tough and firmly cemented by silica to the softer, calcite-replaced bones. Experimenting with a number of hand tools, grinders, hardware-store engravers, and rotary devices, we happened upon a Chicago Pneumatic Air Scribe (see supplier''s address on page 421), and it has since become our primary lab tool on this project. We now have five Chicago air scribes, and progress on our dinosaur has been extraordinary. One large and complex midback vertebra, which had been crushed during fossilization, took seven months to prepare with the scribe, but it was in the middle of a 150-pound block of sandstone. Not only was museum preparator Yolaikia Sciole able to remove this complex and fragile vertebra without damage, but ultimately it was prepared from the inside out, exposing most of the internal bone structures, including arterial and nerve canals and never-before-seen pneumatic structures that lightened the bone in life. Most of the bones in this vertebra are no more than 0.25-inch thick and are replaced by easily cleaved, fragile calcite. The air scribe, and a light touch by the preparator, did the trick. Thermal Structures has nearly 250 materials, mostly ceramic-based in its system. Outer covers are mostly 300 series stainless, with an increasing interest in both Inconel for higher temperature applications and aluminum for lower temperature uses."Sometimes there is a preconceived notion that the metal cover is the blanket," Buckett said. "The real key is the insulation under the metal autolengthguagechopsaw cover. The idea, if we''re in the loop early enough, is to select the right materials and develop a noise or heat blanket for the specific application." ©2003 www.chop-saws.net. All rights reserved. |
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