Researches on diamagnetism and magne-crystallic action : including the question of diamagnetic polarity (1870)
Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 67
opposite names. The balls wererepelled when the current flowed. Preserving the currentconstant, the index above was turned in a direction opposedto the repulsion until the beam stood again at zero. Thetorsion necessary to effect this is evidently the expression ofthe repulsive force exerted at this… … When the glass index pointed to zero, an interval of about TVthof an inch usually separated the nearest surfaces of the dia-magnetic balls from the core ends. The intensity of the current THE TORSION BALANCE. 43 was measured by a tangent galvanometer, and it was varied bymeans of a rheostat. Always…
