Word: pendulums
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Dates: during 1880-1889
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Professor Pickering is at present working upon an experiment for ascertaining the exact location of the pole. The instrument used consists of a stationary reflecting telescope with a plate holder suspended in the centre of the aperture upon a pendulum, to avoid any variations of the telescope which might arise from changes of temperature. The movement of the stars revolving about the pole as a centre are photographed upon the plate, and from the races described the location of the pole can be accurately ascertained by geometrical and trigonometry observations...
...heave of the shoulders at the end of the stroke. Indeed, the dominent virtue of this system of rowing is its smoothness and freedom from all apparent effort. Even in the excitement of a race, when the men are trying to pull the blades off the oars, the continuous pendulum-like motion of the body at the end of the stroke effectually veils their frantic efforts...
...idea of the city. Pisa is situated on the Arno nearer the sea. The city is noted for a group of buildings surrounding the Duomo, or cathedral, which dates from the eleventh century. In this church is the identical lamp from whose movements Galileo deduced the laws of the pendulum. The baptistry is a very handsome building, but the chief interest centers in the well known "Leaning Tower," from whose summit Galileo made his experiments on falling bodies. The attitude of this tower is probably due to the insufficient foundations laid by the builders, which caused it to settle while...