Word: occurred
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Dates: during 1920-1929
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...South African mining areas, notably that at Kimberly, occur in the form of a huge vertical funnel or crater of "pay dirt" descending into the earth to a depth of half a mile or more. At first the area can be worked from the surface by the individual prospector. Later, as the pay dirt funnel is excavated, disastrous slides begin to occur and corporations must be organized to undertake expensive subsoil mining, which has been carried to a depth of 2600 ft. in some instances. Great diamond mining fortunes, like that of the late Cecil Rhodes, are usually made...
...Field's medical confreres were vexed at his publicity. The explanation: radium activates chemical processes that would otherwise occur very slowly if at all. Chemicals coloring the hard carbon-crystals of diamond are oxidized by radium in salts or even weak solutions. Cost ratio: a $100 yellow stone (½ karat) was changed to a $700 blue-white stone in four days, using $8,000 worth (100 milligrams) of radium. The less radium, the longer the time necessary. A difficulty: for speediest effects, the gems, and hands of the experimenters, must be directly exposed to the radium, risking burns...
...this money, state and municipal bonds were issued for $1,399,637,992 last year ($1,398,953,100 in 1924 )†. Remaining deficits came from short term borrowings. In general, municipal securities are safe. Some accident of prosperity seems always to occur to make new borrowings possible, if only to repay old ones...
...tending is a deep sea art. The Colonia is continuously on service, in season and out, finding breaks and mending them. So carefully is each mile of cable charted that little time is lost grappling up the line in two or three miles of ocean. But most breaks occur in shallows. The cable will be scarred or ground in two by icebergs; snagged by fishing trawls; ravaged by boring worms. Once a whale's corpse was found looped in the line. Once a shark's tooth was embedded at a break...
...opening night it played till midnight. It showed dozens of gorgeous scenes, scores of glorified girls, countless songs and scenes. So great was the supply of everything that the mind wearied and the tastes grew tired. One wished that Mr. Ziegfeld had condensed his entertainment. Such condensation will unquestionably occur before ten days are gone...