| 摘要 |
A radiant heater that provides uniform directional disposition of heat includes an elongated cylindrical tubular enclosure of heat resistant vitreous material pervious to infrared radiation, such as VYCOR. A preformed semicylindrical elongated support rod extends longitudinally in the enclosure and provides an uninterrupted generally flat support surface extending diametrically across the enclosure. A single helical resistance element of Kanthal is disposed in the portion of the enclosure not occupied by the support rod. The resistance element extends longitudinally of the support rod and enclosure and is in tangential and direct contact with the flat surface of the support. The support rod is formed of a compressed fibrous material having a low coefficient of thermal conductivity, such as a fibrous aluminum oxide and silicon dioxide composition known as FIBERFRAX.
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