They had sextants, early microscopes, clocks, thermometers, and barometers. |
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On shelves and bookcases around the flat I could see antique spanners, old sextants, shiny brass things, burnished steel telescopes. |
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Angular measurements are made using sextants, theodolites, quadrants and station pointers. |
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Until recently, oceanographers gathered much of their data from solitary vessels that they navigated by means of stars and sextants. |
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And it's equally true now, even though satellites have taken over from sextants, the Sun and fixed stars as the navigation aids of choice. |
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Some sextants used a mirror to reflect the horizon as one half of the view for the sighting and the celestial object as the other. |
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Cook carried an early nautical almanac and brass sextants, but no chronometer on the first voyage. |
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This treatment is covered up to 6 sextants or 4 quadrants or up to 28 teeth per calendar year. |
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The problem is very complex, and navigators continued to use sextants and other astrolabes to find their location at sea. |
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These units incorporated mechanical gyroscopes and while the aircraft were fitted with sextants, it was the INUs that became the primary means of navigation. |
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His expedition required the development and assemblage of a network of geographic and other technologies, including credit systems, ships, maps, and sextants. |
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The correct amount of brightness through the sextants optical light paths is controlled by means of swing in graded filters 4 for the index and 3 for the horizon mirrors. |
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To prevent eye damages, the correct amount of brightness through the sextants optical light paths is controlled by means of swing in graded filters, 3 for the index and 2 for the horizon mirrors. |
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Imagine trying to survey Canada Basin, with depths exceeding 3.5 kilometres, with weighted ropes or lead lines and sextants, as hydrographers did over a century ago charting the world's waterways, fresh and marine. |
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By the late 18th century, navigators replaced their prior instruments with octants and sextants. |
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Like the similar astronomical sextants, they could be used in a vertical plane or made adjustable for any plane. |
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As standards for what counted as a mappable fact rose, knowledge that didn't meet those standards — secondhand travellers' reports, guesses hazarded without compasses or sextants — was discarded and lost. |
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The so-called mariner's astrolabe was later supplanted by sextants. |
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At any stage during the voyage, dependable almanacs, sextants, and chronometers made it possible to ascertain the ship's position with great precision through observation of the altitudes and azimuths of a few familiar stars. |
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Satellite telephones have replaced the cumbersome SSBs, while the GPS has seen sextants, chronometers and astro-navigation tables pushed to the back of the cupboard. |
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Be mindful of where you stow cruising necessities. Metallic items such as spray cans, canned goods, metal sextants and eyeglasses placed within three feet of a compass can affect its reading. |
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Other exhibits include collections of clocks, compasses, quadrants and sextants, calculators, globes, sundials, and surgical instruments of the 18th century. |
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