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On Some New Points in the Mounting of Astronomical Telescopes*

    Naturevolume 6pages525527 (1872) | Download Citation



    THE very great inconvenience attendant upon the use of the ordinary position circle of a micrometer divided on a metallic limb, and the necessity of having small lamps hung on to the micrometer for producing that very useful character of illumination of the wires known as the “dark field,” has induced me to introduce some modifications in this (to the observer at least) very important part of an equatorial instrument.

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