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How is a magnetic compass made?

Magnetic anisotropy

Demagnetizing field

Saturation (magnetic)

Magnetic domain

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A magnetic compass can be made using various methods as described in the provided research contexts. One approach involves creating a magnetic compass with a cylindrical housing, a magnetic compass floating body containing a magnetic bar and bearing dial, filled with liquid for stability and accuracy . Another method includes synthesizing microscale or nanoscale magnetic compasses using ferromagnetic iron carbide nanoparticles encapsulated in carbon needles, exhibiting anisotropic magnetic properties suitable for various applications like electromagnetic wave absorbent materials and magnetorheological fluids . Additionally, a different design incorporates a bowl device with a body and lower body, support unit, display unit, and glass components for a functional magnetic compass . These diverse techniques showcase the versatility in creating magnetic compasses for different purposes.

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Patent Magnetic compass pointing true bearings Liu Yanchun, Fu Jianguo, Wang Haiting - Show less +2 more 23 Oct 2013 1 Citations	A magnetic compass is made with a cylindrical housing, magnetic compass floating body, liquid, magnetic bar, bearing dial, bearing division lines, and true north pointing line for precise true bearings measurement.
Patent Magnetic compass bowl devices O Hak Su 12 Aug 2016	A magnetic compass is made by assembling a body with penetration holes, a support unit with a stopping protrusion, a display unit, and glass sealed with an O-ring and base ring components.
Open access•Journal Article•DOI Microscale magnetic compasses Hidetsugu Shiozawa, Desai Zhang, Michael Eisterer, Paola Ayala, Thomas Pichler, Martha R. McCartney, David J. Smith - Show less +6 more 01 Sep 2017-Journal of Applied Physics	Microscale magnetic compasses are made by synthesizing ferromagnetic iron carbide nanoparticles encapsulated in carbon needles. These compasses align with external magnetic fields, useful in various applications like electromagnetic wave absorbent materials.
Patent magnetic compass which is equipped with a balance member of the display guide portion Oh Man Su, Kin Mi Joung - Show less +1 more 15 Dec 2016	A magnetic compass is made with a main body, display guide units, display grooves, and bubble removing grooves arranged at regular intervals, providing accurate directional guidance.

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