Word: wall
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Dates: during 1960-1969
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Short-Waved. The art of "bugging"* has made spectacular strides since the days when a microphone was a cumbrous object that trailed telltale wires and could be installed only by drilling through a wall from the next room. Slimmed to insect size by transistors and printed circuits, today's microphones can be tucked into a sofa or buried inches deep in walls or floor. With battery-powered transmitters no bigger than a cigarette pack, the new gadgets need no outside power source and can eavesdrop for two whole years without attention. In one East European capital, a foreign service...
...cradle. One of the Poles' pet dodges is to turn an idle receiver into a live mike, a trick most easily accomplished by replacing the phone's regular two-wire flex with a four-strand cable whose extra wires lead either to a transmitter in the wall socket or to an outside tape recorder...
...attempt to reach the boundary layer between the earth's crust and mantle by drilling off the coast of Mexico, so far has penetrated only ordinary, surface-type rocks. Last week, the Woods Hole Oceanographic Institution reported far better success with another method. From the fractured north wall of the Puerto Rico Trench, its research ship Chain has dredged up the first samples of "third layer" rock ever gathered...
...rock. The third layer is normally unreachable, but scientists making a seismic survey in 1959 got hints that it might be exposed on the sides of the Puerto Rico Trench. In 1960 Dr. Earl Hays of Woods Hole took photographs showing fractured rock on the trench's north wall...
When Woods Hole scientists took a closer look at the Trench, they found by echo sounding that its north wall is scored by fractures where deep-down rock seemed to be freshly exposed. Photographs showed the rock too, but bringing it to the surface was no easy task. Any sort of dredging in deep water is difficult; pulling a dredge among rocks and crags at the end of many miles of cable looked almost impossible...