| 摘要 |
<p>An electric resistance wound as a spiral conical helix is described, giving an uniform wire surface in contact with the air, since it is fixed to a fundamentally conical support, consisting of a certain number of stepped laminations, with self-centring point, the resistance wire being preferably shaped as a dense wave, so as to produce uniform heating of the air with simultaneous reduction of the size of the resistance.</p> |
