The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 264
he helix in a per-pendicular position, as shown in the cut,drop through the opening a small iron tubeor rod. This will become strongly magnetic,and be sustained within the coil withoutany visible support^ owing to the force withwhich it is drawn towards the middle of thecoil by the opposite… … * The power of a common Pot Battery is insufficient to cause this experi-ment to succeed. A battery of much greater magnetic force, as the TroughBattery or Groves, should be employed. Design of the Magnetizing Helix seen in Fig. 210 ? Give the experiment withthis. ELECTRO-MAGNET. 259 Fig. 211.…
Physics
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