The Letter Of Per Egr I N Us

day-time, and towards the moon and stars at night, as described in the preceding chapter. By means of this instrument you can direct your course towards cities and islands and any other

TIG. 2.— DOUBLE-PIVOTED NEEDLE
FIG. 3.—PIVOTED COMPASS

place wherever you may wish to go by land or sea, provided the latitude and longitude of the places are known to you. How iron remains suspended in air by virtue of the lodestone, I will explain in my book on the action of mir-

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Saving Power, Saving The World

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