What medium did Shen Kuo describe using to allow a thin, magnetized needle to swing freely and indicate direction?
Answer
Floating on water
Shen Kuo detailed an apparatus where a thin needle, magnetized by rubbing it with lodestone, was made to float on water, which freed the pointer from friction inherent in older designs.
Related Questions
Who is frequently credited with the earliest clear description of a magnetized needle used specifically for direction-finding?In which seminal work did Shen Kuo compile his critical passages concerning magnetism around 1078 AD?What was Shen Kuo's most significant scientific contribution regarding the compass device?What specific direction did Shen Kuo state the magnetized needle pointed relative to true south?What was the typical material and form of the ancient lodestone devices referred to as *sinan*?What was the primary function of the traditional *sinan* devices prior to Shen Kuo's documented improvements?What medium did Shen Kuo describe using to allow a thin, magnetized needle to swing freely and indicate direction?If 'invention' means the first clear documentation of a magnetized *needle* apparatus used for direction-finding with scientific principles, who receives credit?What notable phrase describes Shen Kuo's reputation stemming from his accomplishments spanning mathematics, astronomy, meteorology, and geology?Besides magnetism, what major geological observation did Shen Kuo document regarding the Earth's structure?