Word: cyclic
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Dates: during 1930-1939
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Solar Prophet. Studying the sun as a variable star, Dr. Charles Greeley Abbot of the Smithsonian Institution has found a number of cyclic variations in the amount of sunshine bathing the earth which affect its weather. Last week he announced finding a new short cycle of 16 days. This is closely correlated with wide temperature swings on earth - swings of 15 and even 25°. The pattern of temperature change following the 16-day cycle varies from place to place and from month to month, but Dr. Abbot believes that the value of 16-day temperature prediction to industry...
...glaring on her masthead. Every 15 seconds her fog whistle emitted a mournful blast. The beacon signal, sounded by a motor-driven key controlled by clockwork, went out continuously instead of on the fair weather schedule of 15 min. every hour. The submarine oscillograph, synchronized with the beacon, throbbed cyclic warnings through the water...