Electricity for public schools and colleges (1891)
Larden, W. (Walter), b. 1855 or 6 · London : Longmans · leaf 391
gnetic needle; a sheet of glass between thetwo obviates any disturbance due to air-eddies caused by therotating disc. The needle is deflected in the direction of rotationof the disc, and will, if the velocity be great enough, finally rotatealso. This motion of the needle is not difficult to… … and needle. They would be induced equally if the disc werestationary and the needle rotated. We have thus a reactionbetween needle and disc that tends to stop the relative motion ;and so, if the needle be free to move, it will be urged round in thesame direction as the disc. If slits be cut…
Electricity
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