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Old-Time Nautical Instruments

John Robinson

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Book Excerpt: 
. . .Davis, the inventor of this quadrant, in his “Seaman’s Secrets”, printed in 1594, gives a list of instruments which should be taken on ships, but it is to be feared few vessels carried them all or that owners were able to provide them. It included,—sea-compass, cross-staff, chart, quadrant, astrolabe, instrument to test compass variation, horizontal plane sphere, and paradoxical compass.

[Pg 2]

SIXTEENTH CENTURY SPANISH ASTROLABE
Full size. From Museum of Fine Arts, Boston.

UNIVERSAL RING-DIAL
Diameter 3-1/2 inches. Owned by Mr. Parker Kemble.

No one knows exactly what instruments Columbus took with him on his voyage in 1492. He undoubtedly had [Pg 3] an astrolabe and a cross-staff. The astrolabe was devised during the first millennium and Arabian astronomers had perfected it as early as the year 700. It is really the basis of all future instruments of . . . Read More

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