| 摘要 |
A device for converging sunlight beams so to be able to ignite a fire or do solar cooking; the device consisting of a cylinder of frusto-conica, shape which is outwardly arcuate, the cylinder inner surface forming a reflector of the light beams so that when positioned with its axis parallel to the light beams, and with its wider mouth end toward the sun, the light rays reflected from the inner surface pass out the rear smaller mouth and the light rays converge together at a point rearward of the small mouth.
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