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- Marine_sandglass abstract "A marine sandglass is a timepiece of simple design that is a relative of the common hourglass, a marine (nautical) instrument known since the 14th century (although reasonably presumed to be of very ancient use and origin). They were employed to measure the time at sea or on a given navigational course, in repeated measures of small time increments (e.g., 30 minutes). Used together with the chip log, smaller marine sandglasses were also used to measure the boat speed through the water in knots.Although vital to maritime navigation, marine sandglasses were not accurate measuring instruments for the passage of time; many design and environmental factors could affect the duration of sand's flow, and therefore its reported time. Their use continued through the early 19th century, when they were supplanted by reliable mechanical timepieces, and by other advances in marine navigation.Marine sandglasses were very popular on board ships, as they were the most dependable measurement of time while at sea. Unlike the clepsydra, the motion of the ship while sailing did not affect the hourglass. The fact that the hourglass also used granular materials instead of liquids gave it more accurate measurements, as the clepsydra was prone to get condensation inside it during temperature changes. Seamen found that the hourglass was able to help them determine longitude, distance east or west from a certain point, with reasonable accuracy.".
- Marine_sandglass thumbnail Revolving_ampolleta_4.jpg?width=300.
- Marine_sandglass wikiPageID "25791266".
- Marine_sandglass wikiPageLength "16503".
- Marine_sandglass wikiPageOutDegree "43".
- Marine_sandglass wikiPageRevisionID "676331655".
- Marine_sandglass wikiPageWikiLink Ambrogio_Lorenzetti.
- Marine_sandglass wikiPageWikiLink Astrolabe.
- Marine_sandglass wikiPageWikiLink Backstaff.
- Marine_sandglass wikiPageWikiLink Category:Astrometry.
- Marine_sandglass wikiPageWikiLink Category:Measuring_instruments.
- Marine_sandglass wikiPageWikiLink Category:Navigational_equipment.
- Marine_sandglass wikiPageWikiLink Category:Timers.
- Marine_sandglass wikiPageWikiLink Category:Water_transport.
- Marine_sandglass wikiPageWikiLink Charles_V_of_France.
- Marine_sandglass wikiPageWikiLink Chartres.
- Marine_sandglass wikiPageWikiLink Chartres,_France.
- Marine_sandglass wikiPageWikiLink Chip_log.
- Marine_sandglass wikiPageWikiLink Christopher_Columbus.
- Marine_sandglass wikiPageWikiLink Clock.
- Marine_sandglass wikiPageWikiLink Dead_reckoning.
- Marine_sandglass wikiPageWikiLink Edward_III.
- Marine_sandglass wikiPageWikiLink Edward_III_of_England.
- Marine_sandglass wikiPageWikiLink Ferdinand_Magellan.
- Marine_sandglass wikiPageWikiLink Glassblowing.
- Marine_sandglass wikiPageWikiLink Grid_compass.
- Marine_sandglass wikiPageWikiLink Horologe.
- Marine_sandglass wikiPageWikiLink Hourglass.
- Marine_sandglass wikiPageWikiLink Knot_(unit).
- Marine_sandglass wikiPageWikiLink Longitude.
- Marine_sandglass wikiPageWikiLink Marine_chronometer.
- Marine_sandglass wikiPageWikiLink Marine_navigation.
- Marine_sandglass wikiPageWikiLink Navigation.
- Marine_sandglass wikiPageWikiLink Octant_(instrument).
- Marine_sandglass wikiPageWikiLink Quadrant_(instrument).
- Marine_sandglass wikiPageWikiLink Rhumbline_network.
- Marine_sandglass wikiPageWikiLink Timepiece.
- Marine_sandglass wikiPageWikiLink Water_clock.
- Marine_sandglass wikiPageWikiLink Zenith.
- Marine_sandglass wikiPageWikiLink File:Ambrogio_Lorenzetti_002-detail-Temperance.jpg.
- Marine_sandglass wikiPageWikiLink File:Ampolleta_de_corredera.jpg.
- Marine_sandglass wikiPageWikiLink File:Marine_sandglass_wm.jpg.
- Marine_sandglass wikiPageWikiLink File:Peleus-Thetis-350.jpg.
- Marine_sandglass wikiPageWikiLink File:Revolving_ampolleta_4.jpg.
- Marine_sandglass wikiPageWikiLinkText "Marine sandglass".
- Marine_sandglass wikiPageWikiLinkText "sandglass".
- Marine_sandglass hasPhotoCollection Marine_sandglass.
- Marine_sandglass wikiPageUsesTemplate Template:Quote.
- Marine_sandglass wikiPageUsesTemplate Template:Reflist.
- Marine_sandglass wikiPageUsesTemplate Template:Time_measurement_and_standards.
- Marine_sandglass subject Category:Astrometry.
- Marine_sandglass subject Category:Measuring_instruments.
- Marine_sandglass subject Category:Navigational_equipment.
- Marine_sandglass subject Category:Timers.
- Marine_sandglass subject Category:Water_transport.
- Marine_sandglass hypernym Timepiece.
- Marine_sandglass type Instrument.
- Marine_sandglass type Instrument.
- Marine_sandglass type Quantity.
- Marine_sandglass type Sub-discipline.
- Marine_sandglass type Tool.
- Marine_sandglass comment "A marine sandglass is a timepiece of simple design that is a relative of the common hourglass, a marine (nautical) instrument known since the 14th century (although reasonably presumed to be of very ancient use and origin). They were employed to measure the time at sea or on a given navigational course, in repeated measures of small time increments (e.g., 30 minutes).".
- Marine_sandglass label "Marine sandglass".
- Marine_sandglass sameAs Ampolleta_(nàutica).
- Marine_sandglass sameAs Ampolleta_(navegación).
- Marine_sandglass sameAs Jam_pasir_marin.
- Marine_sandglass sameAs m.09v7dmh.
- Marine_sandglass sameAs Q3819410.
- Marine_sandglass sameAs Q3819410.
- Marine_sandglass wasDerivedFrom Marine_sandglass?oldid=676331655.
- Marine_sandglass depiction Revolving_ampolleta_4.jpg.
- Marine_sandglass isPrimaryTopicOf Marine_sandglass.