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Dr. Lester Machta of the Weather Bureau (left) strips the protec tive covering from a sheet of gummed paper used to catch radio active "fall out" material from the Nevada A-bomb tests. D. L. Harris, his associate, holds the metal frame for the paper. They are making a special test on the roof of the bureau at 2400 M street N.W. Serve EASY MEAIST&ate feud Os/ I Beef and Gravy makes simple CAN'T-MISS MAIN DISHES ;^ iii at surprising low 1 Pv You can fix Krey Beef and Gravy dozens f. of thrifty ways. On a bed of rice, casseroled BPljr fl K OuP with-macaroni, in a simple hot roast beef Jf sandwich, or as shown here. They are all . .c^p^aaaßa|^^^aaaaEaaajaßMp^^aß^^^a^^awpMw^^. ~ dm d®k And so easy to make. For Krey brings 9H| JW you tender lean-beef WMF brown gravy —a// ready to heat! Already ‘ HR 4H Nufi cooked the special Krey way for hearty «• simmerin’-good main dishes! eLm v Going to the store soon? Get Krey Beef 9 _ and Gravy and be proud of your easy meals'. d4g KREY PACKING CO., Gamral Officer: Si. Louis, Mo. I Quality Midwestern Meat Products Since 1882 Vn p: BBHBWBj^|rwy^^WJHlTaT^Byß PAGE 24 -THE WASHINGTON ST At PICTOtIAI MAGAZINE. APtll 17, 195 S SCIENCE Tracing Radioactive 'Fall Out' Silver Hill Weather Station Traps Atomic Debris S~ CIENTISTS given pieces of gummed paper and favor able winds, can trace radio active debris from the Nevada A-bomb testing site all the way across the country. At a station just across the District line in Silver Hill, Md.. which is one of 125, the Weather Bureau puts out its traps to catch “fall out”— radioactive particles flung to the winds by atomic explosions. Dr. Lester Machta. chief of the bureau’s special projects section, and D. L. Harris, who works with him on fall out, say they can trace particles from known explosions in the coun try. They cannot tell, they say, whether anybody else—like the Russians—has been shooting off atoms. The Atomic Energy Commission can tell but won’t say how it is done. The Weather Bureau got into atomic testing because so many people thought the explosions could affect weather. It stays in it now for two reasons: 1. There could be danger from excessive fall out. 2. The atomic particles give By Frank Sartwell, Jr. better data on wind than any other method the bureau? has. The extent of wind-carried fall out was not realized, Dr. Machta said, until a heavy snowfall ’ around Lake Erie brought down enough radio activity from the first Nevada tests to worry people. For the second Nevada series the bureau was ready. In addition to its gummed-paper tests scattered across the coun try, it tried.two other methods: A vacuum cleaner that sucked in air and filtered it, and a shallow trough that caught rain or snow and filtered it. The gummed paper apparatus was found just as good and the more complicated methods were discarded. In the test, a foot-square piece of gummed paper is put on a small stand in an open place. Radioactive particles fall on it and stick. (They stick in rain or snow, too. Dr. Machta said.) The paper is exposed 24 hours, then folded sticky side in. placed in an ordinary envelope and mailed to the New York operations office of the AEC. There, it is burned up in a furnace, and the ashes placed in a little plastic cup about the size of a quarter. This is put in a plastic tape and run through a geiger counter. After the AEC does whatever it wants with the results, they are sent on to the bureau here. What has been learned from all this? First, the scientists say, there is not enough fall out here, or any other place, except close beside the explosion itself, to hurt us. Second, atomic bombs do not affect the weather in any way the bureau can determine. Third, some predicted winds have not behaved as predicted. Tracing forest fire smoke, moisture or constant-level bal loons is not as accurate as tracing invisible chunks of exploded atoms. This, in the long ran, can improve weather forecasting.