Elements of plane and spherical trigonometry (1833)
Young, J. R. (John Radford), 1799-1885 · Philadelphia, Carey, Lea & Blanchard · leaf 72
being now sap-pended horizontally, and so as to allow theneedle to settle itself freely, will point outthe four cardinal points of the horizon, asalso the several intermediate points, provided only that it is the propertyof the magnetic needle to point due north and south. Such, however,is not… … OS PLANE AND SPHERICAL TRIGONOMETRY. direction of the compass, or the angle it makes at any place with a linepointing duly north and south, maybe ascertained at any time by astro-nomical observations, and thus the deviation of the compass-points,from the corresponding points of the horizon, may…
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