Word: guardedness
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Wright had built daringly and well against earthquakes: he designed the Imperial to float like a flexible collection of barges on Tokyo's soft mud. The floors were cantilevered on supports which carried them the way waiters carry trays on one hand. To keep the center of gravity low...
Infantry, field artillery and aircraft ammunition was likewise carefully guarded by Ordnance to keep it clean. When the attack came, planes at Bellows Field had no .30-cal. machine-gun bullets.
All through the perilous spring of 1942, the scientists worked. In numerous guarded laboratories, their strange apparatus glowed and hummed. By June they had made progress. The program mushroomed, was transferred to the War Department.
Rigid precautions guarded the health of the workers. They all carried small electroscopes or bits of photographic film for nightly tests to show the amount of radiation to which each had been exposed. A gadget called "Sneezy" measured radioactive dust in the air; "Pluto" watched lab desks and instruments. Clothing...
How the atomic explosive is made is one of the world's most closely guarded secrets. But the fundamental principle behind it can be understood by any layman.