Abstract
THIS instrument consists of two moveable circles, which may be made of brass or pasteboard, placed in a common watch-case. The lower and outer one shows the hours doubled up to XXIV., and divided into quarters. The upper one, which is also inner, shows the sixty minutes, 5, 10, &c. This circle is a narrow one, and works on the plain inmost rim of the lower one, so as to admit of the hours being seen outside the minutes.
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MAYNE, A. Mayne's Sidereal Dial . Nature 8, 366 (1873). https://doi.org/10.1038/008366a0
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DOI: https://doi.org/10.1038/008366a0