[Coffin, John Huntington Crane], 1815-1890. [from old catalog] · New York, D. Van Nostrand · leaf 285
er its altitude should be measured, or thetime noted, so as to find its azimuth simultaneously. The instrument should be carefully adjusted and levelled.With the compass or plane table, it is not well to observeobjects whose altitudes are greater than 15°. A theodolite can be used with greater… … 278 NAVIGATION. The error of collimation is eliminated by making two ob-servations with the telescope reversed either in is Vs, or byrotation on its axis. Low altitudes are generally best. 276. If the sun is used, each limb may be observed alter-nately ; or a separate set of observations may be…
Navigation · Nautical astronomy
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