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Perfect in one direction but often does not show.
we can show it by experimenting. for eg. iron (which prevents self demagnetisation) also attracts magnets
Water flows downhill. Contour lines show the slope of the landscape, and the direction a stream must flow.
phototrophism
You could use a weather vane
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to show the direction of a magnetic field
compass is an instrument containing a freely suspended magnetic element which displays the direction of the horizontal component of the Earth's magnetic field at the point of observation. The magnetic compass is an old Chinese invention, probaly first made in China during the Qin dynasty (221-206 B.C.). Chinese fortune tellers used lodestones (a mineral composed of an iron oxide which aligns itself in a north-south direction) to construct their fortune telling boards.
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what instrument was invented by Chinese to show direction
Yes it does
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