Input circuit, [187]

Interference, [249]

Internal resistance, [191]

Ion, definition of, [19];
positive and negative, [20], [21]

Ionization, [20]

Larynx, [153]

Laws of attraction, [204]

Loading coil, [224]

Loop antenna, [198]

Magnet, pole of, [203];
of soft iron, [205];
of steel, [205]