Word: pendulums
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Dates: during 1900-1909
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...department of geology and geography, Professor R. DeC. Ward '89 announces that the Bosch-Omori seismograph, or "tromometer," has been installed, but that, on account of difficulties experienced in the rusting of important wires which support the pendulum, the arrangements for measuring the exact time of earthquakes are unsatisfactory. It is hoped soon to obviate this difficulty...
Lippincott's--"The Doubting Folly," by G. L. Walton '75; "The Pendulum Swings," by W. H. Osborne...
...clock today Professor W. M. Davis will explain the use of the Foucicault pendulum hung in the well of the staircase from the roof of the geological wing of the University Museum. He will show how the latitude may be determined by the apparent deviation of the pendulum from its plane of swinging which is caused by the rotation of the earth...
...well of the stairway in the addition affords excellent opportunity for repeating Foucault's celebrated experiment demonstrating the rotation of the earth, by means of swinging a long pendulum, the deflection of which from its plane shows the rotation of the earth. During the second half year this experiment will be tried...
...During the day these plates are developed in the observatory dark room, by a mechanical method, recently devised by a member of the department. Twelve plates are placed at one time in a brass frame, which is kept in vertical motion by the action of a large pendulum. As the object is to get the faintest details, rather than the artistic effect of lights and shadows all plates are treated as if under exposed. In this way twenty-four plates may be developed simultaneously without requiring any constant attention. Previously this same work required the attention of several men, during...