Word: cones
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...Cone...
...child's readiness to read, the teacher must make sure not only of his eye, but also of his ear. Thus, the pupil may be given a series of pictures and asked to circle the object that the teacher names. If he mistakes a comb for a cone or a bear for a pear, he is obviously on his way to mistaking "institute for "introduce." In another series of pictures, the teacher may try to put across certain abstract concepts. A pupil will be asked to draw a ball beside, under or above another object; or, he may have...
...very well. The wakes of the little jets of gas acted upon each other and caused violent turbulence that made too much noise of its own. Next they added to the tail pipe a metal cylinder with holes all around and closed at the rear end with a metal cone. It worked well in reducing noise level, but since the gas jets pointed every which way, the engine lost nearly all of its thrust...
Pratt & Whitney's silencer has not yet been tested in flight. For actual installation in airliners, it will be made of several telescoping cylinders fitting around the tail pipe, and a segmented cone that can be closed or opened. When the airplane takes off within earshot of neighbors, the cylinders will be extended and the cone closed. The mighty stream of hot gases will be broken into small and comparatively quiet jets. After the aircraft is high in the air, the cylinders will be drawn back into the engine's nacelle and the cone will be opened. Then...
Most of the earth's wobbling is a grand motion that makes its axis describe a 23° cone once every 26,000 years. This precession is caused by the pull of the sun and the moon acting on the slightly nonspherical shape of the earth. Superimposed is a subtler wobble. The axis keeps steady in space, but over an uneven period of about one year, the bulk of the earth moves slightly in relation to the axis...