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Extemporary Measurements 23 To set off a Bight Angle from any point on the ground by means ofa Bope 25 To find the Distance of an inaccessible object with a Measuring Line 25 5. George's Mercurial Barometer 26 To fill: Spiral Cord method 26 To empty the Barometer 26 6. 46 Equal Altitudes of a Star on the same side of the Meridian on difierent nights . 48 Table for ascertaining Heights and Distances by the Box-Sextant 50 To measure the angular distance between the Moon and Sun . IX PAGB To measure the angular distance between the Moon and Star or Planet 52 Obseryations for finding the Longitude 53 General remarks on Observing 54 12.

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82 ,f Longitude by the Occultation of a Star (Example) 84 To find the Longitude by Eclipses of Jupiter's Satellites . 88 Preparatory problem ; To describe an oblique circle which shall pass through two given points 88 Example 89 14.

of the Moon 79 To find the Longitude 79 Example 80 To find the Longitude by the Occultation of a Fixed Star . To find the Latitude by observing the times when two different pairs of Stars are vertical one above the other (i.e. PAGE The Observation 87 To project the problem stereograpbically on the Plane of the Equmoctial 87 To measure an arc of more than 90° by the Scale of Chords.

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