On the Horizontal Photographic Telescope of Long Focus *

    Abstract

    IN what I have now to say in regard to the methods of Photography employed in observing the recent Transit of Venus, I shall confine myself to the subject of the instruments used, having especially in view the explanation of the advantages of the horizontal telescope and its origin.

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    On the Horizontal Photographic Telescope of Long Focus * . Nature 12, 273–275 (1875). https://doi.org/10.1038/012273b0

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