Abstract
AN interesting form of micrometer is described by Herr Karl Schwarzschild in Astronomischen Nachrichten, No. 3335. The idea is gathered from the instrument which Michelson suggested and used for measuring small diameters and distances, an account of which appeared in the Memoirs of the National Academy of Science, Washington, 1891. Michelson, it may be remembered, placed before the object-glass of his refractor a disc in which were two parallel movable slits that set up interference phenomena; and an observation consisted in noting simply the disappearance and reappearance of the interference bands. Schwarzschild's disc, or more accurately oblong framework, on the other hand, contains several slits cut out at equal distances from one another, which cause several images to be visible at the eye-end of the telescope, forming a true multiple-image micrometer.
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D. The Measurement of Double-Stars by Interference. Nature 53, 496 (1896). https://doi.org/10.1038/053496a0
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DOI: https://doi.org/10.1038/053496a0