A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 457
FIG. 238. The process of magnetization can be helped on by tapping the barsmartly with a heavy stick while it is in the vertical position.To show this, hold one end of the vertical bar at such a distancefrom the needle as to produce a rather small deflection before thebar is struck, and then note…
Physics
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