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Radio Record, Volume IX, Issue 2, 19 July 1935, Page 54

The higher the freqnency of an alternating currént, the greater the resistance offered to it by a given series inductance, and the smaller the resistance offered to it by a given seriés capacity. Ohmic resistance remains _ unchanged despite any change of frequency by an alternating current. If a fairly large nail is driven up through an old baseboard a reel of — wire may be ‘placed over this when coll-winding is carried out. And if three or four other small nails or Staples are "staggered" over the baseboard and the wire threaded between these, the desired tension when winding may be obtained. ra