Compass | 合法醫療器材資訊網
In1745GowinKnight,anEnglishinventor,developedamethodofmagnetizingsteelinsuchawaythatitwouldretainitsmagnetizationforlongperiodsoftime ...
compass, in navigation[1] or surveying, the primary device for direction-finding on the surface of the Earth[2]. Compasses may operate on magnetic[3] or gyroscopic principles or by determining the direction of the Sun or a star.
The oldest and most familiar type of compass is the magnetic compass[4], which is used in different forms in aircraft, ships, and land vehicles and by surveyors. Sometime in the 12th century, mariners in China and Europe made the discovery, apparently independently, that a piece of lodestone[5], a naturally occurring magnetic ore, when floated on a stick in water, tends to align itself so as to point in the direction of the polestar. This discovery was presumably quickly followed by a second, that an iron or steel needle touched by a lodestone for long enough also tends to align itself in a north-south direction. From t...
Compass | 合法醫療器材資訊網
Compass Invention | 合法醫療器材資訊網
compass | 合法醫療器材資訊網
Compass | 合法醫療器材資訊網
History of Compass | 合法醫療器材資訊網
History of the compass | 合法醫療器材資訊網
Smith College Museum of Ancient Inventions | 合法醫療器材資訊網
WHO INVENTED THE COMPASS? | 合法醫療器材資訊網
Who invented the magnetic compass? Navigating the timeline ... | 合法醫療器材資訊網
【絕緣電極注入針】許可證字號:衛署醫器輸字第004941號
器材品名:絕緣電極注入針許可證字號:衛署醫器輸字第004941號註銷狀態:已註銷註銷日期:1999/12/01註銷理由:未展延而逾期者;;...
【絕緣電極注入針】許可證字號:衛署醫器輸字第003911號
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