Word: clockwork
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Dates: during 1900-1909
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...seismograph with two 100 kilogram conical pendulums, one swung in the meridian and the other east and west, will shortly be placed on a suitable foundation in the basement of the Geological section. This type of instrument records earth vibrations on smoked paper carried on revolving drums operated by clockwork. One of the same general type which has been set up in the State Museum at Albany, New York, for more than a year, on a clay foundation like that underlying the Harvard station, gave complete records of the San Francisco, Valparaiso, and the great Indian earthquakes. The Harvard station...
...predicted for Thursday or Friday night. This is the last time they may be expected for thirty-three years, and ample preparations have been made at the Observatory to cover the entire field of the shower. Four cameras have been mounted on a platform moved by clockwork so that they will cover the same sixty degrees of the sky, throughout the entire shower. Six other instruments will be in use for determining the spectrum, magnitude and distance of the Leonids, and the radiant from which they come...