Word: filtered
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...Around him were wells producing oil by the waterflood method, in which oil is recovered by pumping water into the ground, thus increasing the underground pressure and forcing oil up the well. On the surface, the oil and water are separated, and the water is passed through a sand filter before being recirculated through the well...
Near one of the sand filters Shepherd got a surprise: his scintillator needle indicated high radioactivity. Shepherd scooped up some filter sand and shipped it off to the Atomic Energy Commission's office in Grand Junction, Colo. AEC reported that the sand contained up to 0.75% uranium, almost four times as rich as minimum commercial ore. The uranium, said AEC, was being deposited in the sand by water. But since sand is a poor concentrator, it was probably catching only about 20% of the uranium in the water...
Shepherd mixed some coal, a good uranium concentrator, with the sand in one of the oil-well filters. When he sent the filter coal to the Atomic Energy Commission after a few weeks, he got the report that it was several times as rich in uranium as the sand. Shepherd then took some shallow-core samples of the rock in one section of Nowata County and shipped them off to AEC. The assays showed a uranium content well above the lowest commercial grade...
...FILTER-TIP WAR is still heating up. P. Lorillard Co.'s Old Gold will soon be marketed in a new king-size, filter-tip version, the first time one of the "Big Six" brands has come out with a filter. Other big names may have to follow soon, since filter-tips have climbed from 3% to 8% of the market in the first six months of 1954, are expected to hit 12% by the end of the year...
Under the code, the ads would not claim that smoking a particular brand "is beneficial to health in any respect," or "nonirritating." Nor would they imply that a brand's ingredients, method of manufacture, length, added filter, etc., reduce nicotine, coal tars and resins unless scientifically proved. The ads would not refer to the "throat, larynx, lungs, nose, or any other part of the body," or to "digestion, energy, nerves or doctors...