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Beaming from an almost cloudless afternoon sky , our solar furnace showed the welcome warmth still available from its direct rays in mid-October.

There is plenty of innovation too, from Louis XIV's "ardent mirror", prefiguring the solar furnace, to Madame de Châteauroux's "flying chair", actually the first lift.

The dark interspaces may represent matter which has become cooled and darkened through having parted with its heat and light, and is falling back again into the solar furnace.

"Has the power crew set up the solar furnace?" he asked.

He used the solar furnace that had made the silicone wool to smelt it.