Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 384
otted upon the chart being practically perpendicularto the direction of the sun at the time of the corresponding observa- Greene—The Hautrigon, etc. 327 tion, it is evident that if the compass bearing of the sun had beentaken at the same time it could now be compared with the true bear-ing of the… … lower arc ; and A, the altitude arc. D, L and A, represent arcs ofgreat circles of the earth, the first two being meridians, while H is anarc of a parallel of south latitude, placed in this instrument at 30°.This combination is, in short, a skeleton of less than one-third of aglobe. The planes of D…
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