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powerful are the son's rays when conden- sed by burning glasses, ,that lis said Archi- me6cs set fire to the Roman fleet, at the siege of Syracuse, by combination of these glasses and Buffon, in 1787, con- structed reRecting mirror of 16S panes of glass, moveable on hinges. which set fire to wood at the distance of l50 feet, and melt ed lead at 145 feet.