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The magnetic compass was first invented as a device for divination as early as the Chinese Han dynasty and Tang dynasty (since about 206 BC). [1] [3] [34] The compass was used in Song dynasty China by the military for navigational orienteering by 1040–44, [22] [35] [36] and was used for maritime navigation by 1111 to 1117. [37]
A "deep-well" design is used to allow the compass to be used globally with a card tilt of up to 8 degrees without impairing accuracy. [24] As induction forces provide less damping than fluid-filled designs, a needle lock is fitted to the compass to reduce wear, operated by the folding action of the rear sight/lens holder.
The Chinese polymath Shen Kuo (1031–1095) of the Song dynasty (960–1279) was the first to accurately describe both magnetic declination (in discerning true north) and the magnetic needle compass in his Dream Pool Essays of 1088, and the Song dynasty writer Zhu Yu (fl. 12th century) was the first to mention use of the compass specifically ...
Researchers discovered a 500-year-old compass in a hidden chamber in Frombork, Poland, possibly used by Copernicus, shedding light on his astronomical work.
The term "portolan chart" was coined in the 1890s because at the time it was assumed that these maps were related to portolani, medieval or early modern books of sailing directions. [2] Other names that have been proposed include rhumb line charts, compass charts or loxodromic charts [ 3 ] whereas modern French scholars prefer to call them ...
A beam compass and a regular compass Using a compass A compass with an extension accessory for larger circles A bow compass capable of drawing the smallest possible circles. A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs.
One page that is dedicated to celebrating photography from history is Old-Time Photos on Facebook. This account shares digitized versions of photos from the late 1800s all the way up to the 1980s ...
A Brunton compass, properly known as the Brunton Pocket Transit, is a precision compass made by Brunton, Inc. of Riverton, Wyoming. The instrument was patented in 1894 by Canadian-born geologist David W. Brunton. [ 1 ]
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