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Excerpt from Old-Time Nautical InstrumentsBased on this instrument, by laying out the circle on a table, John Davis, the explorer, devised his quadrant in 1586. At first the observer used it by facing the sun, as the cross-staff had been used, but a better form was made later where the observer had the sun at his back. This instrument has been called by sailors jackass

Title : Old-Time Nautical Instruments (Classic Reprint)
Author : John Robinson
Language : en
Rating :
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Type : PDF, ePub, Kindle
Uploaded : Apr 03, 2021

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