| 摘要 |
A gas fire ember element comprises a bundle of wire of a heat and oxidation resistant metal (Fecralloy® or Nichrome®, for example). The density of wire in the bundle is so loose (between 0.01 and 0.1% by total volume of the bundle) that burning gas percolates through it. The wire has a filament cross section of between 500 μm2 and 8,000 μm2. so that it quickly glows and stops glowing as it is heated or not heated by flickering gas flame. The bundle can be hollow, said wire being confined to a surface region of the bundle having a thickness between 50 μm and 5,000 μm. Either the density of wire in the surface region is between 0.01% and 0.1% by total volume of the surface region, or a projection of the wire in the surface region occupies between 0.01% and 0.1% by total area of said projection. The wire in the surface region may be a mesh.
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