Wright, Mark R., 1854- · London : Longmans · leaf 163
m, or tends to set them, in certain definite directions. Thesedirections are called Unes of force. We find the direction of 154 Magnetism these lines of force by taking a very small magnet, placing it inany part of the field, and marking its direction ; it is then movedso that one end takes the… … Fig. 149. upon a sheet of cardboard or glass; underneath is placed asingle magnet or a combination of magnets. When the glassis tapped, the filings arrange themselves in curves. The direction
Physics
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