A History of the Navigator's Sextant
This pre-history of the sextant, as we might call it, will emphasize the problems that were to be overcome in leading up to the invention, or rather evolution, of an instrument that has for long been the very symbol of the navigator's art.Referring to figure 6.7, the upper diagram illustrates the geometrical principle of, and the lower diagram illustrates its ... The eye-vane is fitted to the graduated chord AC, and the instrument is used in the same way as the 90Ad-backstaff.
| Title | : | A History of the Navigator's Sextant |
| Author | : | Charles H. Cotter |
| Publisher | : | Sheridan House Incorporated - 1983 |
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