Abstract
In [Fig. 3.3], the fig. 1, 2, and 3, represent the several parts of this instrument; fig. 4, part of the telescope with the instrument applied to it, and 5 the rest on which the whole is supported. Fig. 1 represents the brass box with the whole instrument, except only the moveable cover, and the screws by which it is fixed to the telescope.
By Robert Hooke
Philosophical transactions of the Royal Society, v.ii, (1667), 195–7
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- 1.
i.e. carefully [DS].
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i.e. outside [DS].
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This rest (by Mr. Hook’s suggestion) may be rendered more convenient, if, instead of placing the screw horizontal, it be so contrived that it may be laid parallel to the equinoctial, or to the diurnal motion of the earth. For by that means the same thing may be performed by the single motion of one screw, which in the other way cannot be done but by the turning of both screws.
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© 2012 Springer Science+Business Media New York
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Sellers, D. (2012). Appendix 1 Description of Mr. Gascoigne’s Micrometer. In: In Search of William Gascoigne. Astrophysics and Space Science Library, vol 390. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4097-0_17
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DOI: https://doi.org/10.1007/978-1-4614-4097-0_17
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