Word: cogwheel
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Dates: during 1930-1939
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...times of Jupiter's satellites according to Earth's distance from that planet. His calculation was only about 3% too high. First terrestrial measurement was made in 1849 by Armand Hippolyte Louis Fizeau of France, who passed a beam of light through the teeth of a spinning cogwheel. The light struck a mirror, bounced back to the wheel. The wheel had been timed to move just enough in the brief interim for the teeth of the wheel to intercept the light as it was reflected. By timing the revolutions per second of the cogwheel and measuring the distance...
...Chicago last week there was a notable directors' meeting, not for big corporations but of Rotary International, whose crest is a cogwheel and whose motto is "Service above Self-He profits most who serves best." To 1,000 lunching Rotary Clubs throughout the land and to the city where Rotary was born 29 years ago. the directors brought messages of Hope. Goodwill and a Bright Future from all over the world. Samples: "India faces the future with confidence." -Frederick Ernest James, Madras planter and Honorary General Commissioner of Rotary for Middle Asia. "Leaders of China are engaged in reconstruction...