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[7]
And this they usually effect by means of metallic mirrors, the concavity of which is made to follow the sides of an isosceles rectangular triangle, and which converge from their circumference to a single point in the centre. When, therefore, these are placed opposite the sun, so that its rays, as they fall upon them from all sides, are collected and concentrated at the centre, the air itself is rarefied there, and very light and dry substances placed there quickly blaze up from its resistance, the sun's rays now acquiring the substance and force of fire.
Plutarch. Plutarch's Lives. with an English Translation by. Bernadotte Perrin. Cambridge, MA. Harvard University Press. London. William Heinemann Ltd. 1914. 1.
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