gas chainsaw

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CONSTRUCTION: Rhine-Schelde-Veroime, Rotterdam, Holland, 1977.PERFORMANCE: Water depth--300''; Drilling depth--20,000''.VARIABLE LOAD: 1,700 mt.HULL: 207.58'' x 177.88'' x 22.22''.QUARTERS: 70 persons.HELIPORT: Accommodates S-61, MI-8.STORAGE: Mud & Cmt Bulk--6,300 cf; LiquidMud--1,189 bbl; Fuel--4,176 bbl; Water forDrilling--5,562 rigid gas permeable contact lenses bbl; potable water--906 bbl.drilling equipment: drawworks--nat''l. 1320ue, 2,000 hp; pumps--two nat''l. 12-p-160,1,600 hp;prime movers--five cat d-399, one cat. 3508; rotary

6 pa; rotary table--nat''l type c-375, 37 1/2";top drive--varco tds 3-s.derrick: 147''; 1,000,000-lb hook load.bop system: hydril msp 30", 1 k diverter;hydril msp 21 1/4", 2 k; shaffer lws 21 1/4", 2 singles;shaffer spherical 13 5/8", 5 k; ciw ram type u,13 5/8", 10 k, two double.cranes: two nat''l os215 w/140'' booms; 32-mt max. cap.mooring: two acta single drum; one doubledrum; four offdrill 11 anchors, 3,629-mt each.remarks: zero discharge.work area: adriatic.panonrig design: levingston class iii

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 chainsaw engravers, and rotary devices, we happened upon a chicago pneumatic air scribe (see supplier''s address on page gas 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 chainsaw has been extraordinary. one large and complex midback vertebra, which gas 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 chainsaw out, exposing most of gas the internal chainsaw bone structures, gas and chainsaw 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.

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