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2. Uunartoq Disc - Wikipedia

   en.wikipedia.org/wiki/Uunartoq_Disc

   Like a sundial, a sun compass features a vertical pin. The sun's rays cause the pin to cast a shadow which is longer in the morning and late afternoon and shortest at solar high-noon, and this shadow is used to create gnomonic lines. The disc is placed in a fixed level position and an observer regularly marks the different lengths and positions ...

3. Silva compass - Wikipedia

   en.wikipedia.org/wiki/Silva_compass

   Silva Field baseplate compass on a map. Silva Sweden AB is an outdoors products company that sells handheld compasses and other navigational equipment including GPS tools, mapping software, aircraft altimeters, and marine navigation tools.

4. Compass - Wikipedia

   en.wikipedia.org/wiki/Compass

   A modern military compass, with included sight device for aligning. A compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with magnetic north.

5. Sector (instrument) - Wikipedia

   en.wikipedia.org/wiki/Sector_(instrument)

   The sector, also known as a sector rule, proportional compass, or military compass, was a major calculating instrument in use from the end of the sixteenth century until the nineteenth century. It is an instrument consisting of two rulers of equal length joined by a hinge.

6. Brunton compass - Wikipedia

   en.wikipedia.org/wiki/Brunton_compass

   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] Unlike most modern compasses, the Brunton Pocket Transit utilizes magnetic induction damping rather than fluid to damp needle ...

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!