Word: instrument
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Dates: during 1880-1889
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...astronomers at the observatory have been by no means idle, but even harder at work than in the winter. The most interesting piece of news from this department is the generous gift of $50,000, by Miss C. W. Bruce, of New York, for a photographic telescope. The instrument will be made with a double lens, a new form not yet adopted by European astronomers, but considered by Professor Pickering far superior to single lens telescopes. It will have an aperture of twenty-four inches. Its focal length will be short, and consequently it will include a large area...
...knowledge of the violin and singing useful. Besides these accomplishments a musical education should include a knowledge of the theory of music, which is taught here, and a physiological study of the throat and hands is important. It is inadvisable to make a specialty of string or wind instruments, for a man who does so will have to compete with foreigners, who have given all their attention to their instruments, and will play for less than Americans can afford to. Playing on the pianoforte does not require so much time as the violin, and the best authorities consider that...
...work now being done is manifold. Professor Hall is at present busy in investigating how much steam is lost in the cylinder of an engine when in work. On account of the extreme heat thermometers cannot be used, and Professor Hall is therefore employing a very delicate electrical instrument. The relation of light to electricity and magnetism is being worked up by Mr. D. W. Shea. The apparatus is arranged in such a manner as to investigate whether light is a manifestation of electricity or not. Professor B. O. Peirce and Dr. Wilson are trying to determine the rate...
...availability of the plane mirror in practical astronomy has long been known. Prof. Winlock applied it in his experiments is solar photography. French astronomers also have used it in their "equatorial code." The new "horizontal telescope" is a much simpler and less expensive instrument and has the advantage of retaining more light and being no more liable to distortions or variations from changes of temperature than an ordinary reflecting telescope...
...beginning this series of photometric observations, about ten years ago, Prof. Pickering first made use of a horizontal telescope and mirror attachment. The instrument was called a "photometer." There was a companion telescope, also horizontal, combined with it for observing the reflected image of the polar star. The same instrumental adaptations were made for the subsequent or second series. This long experience gave confidence in incurring the expense of the larger under-taking now brought to perfection...