Word: layer
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This time the trouble was traced to a layer of insulation in the Atlas-D's giant fuel tank (65 ft. high; 10 ft. in diameter). The insulation had somehow absorbed some kerosene-like fuel, which is mixed with liquid oxygen when the missile is fired. Engineers set about correcting the fault, and space scientists got ready to start the complex preflight tests all over again. Scheduled date for the next...
...dried cow dung, 400 Hindu pundits and priests have gathered." Dried cow dung- indeed. A thin solution of cow dung and water is patted on the ground to produce a hard greyish surface which is then artistically decorated with various colored pigments. The result is a sweet-smelling, smooth layer that holds up under normal traffic for many days. Since the worshipers remove their sandals, the floor of the enclosure is far cleaner than the floor of the average department store one hour after opening...
From ground level to about 16 feet down, the earth beneath the Abri Pataud is a series of thin layers, like a plank of plywood. Each layer, or stratum, is half-an-inch or so thick. Many of these strata constitute "occupation layers": buried within each are flint and bone objects that accumulated as the layer slowly accumulated during geological history. Some of the layers represent a year's occupation of the Abri Pataud; others contain the relics of 10, 20 or more years. A few yield no bones or man-made objects for they were laid down while...
With the pipes in places, two parallel trenches are dug, about ten feet apart and three feet wide. These slices reveal the earth layers piled on top of one another, and the digging--a chore which falls on trained college and graduate students--proceeds horizontally from one trench to the other, one thin layer at a time. The digger usually pokes his way along with a large screw driver bent into a right angle. Occasionally he uses a spatula-like tool to skim off the dirt. As the work proceeds boards are placed down to prevent damage to the underlying...
Keeping to one layer is fairly easy if its dirt has a distinctive color. Otherwise, the digger uses other criteria, for example the "feel" of the dirt-some layers are stickier or harder than others...