burning glass definition

  • noun:
    • a convex lens of considerable size, used for making a rigorous heat by converging the sun's rays to a focus.
    • A double convex lens of cup familiar with ignite combustible substances, melt metals, etc., by focusing upon them the direct sun.
    • a convex lens of considerable dimensions, employed for making a rigorous heat by converging sunshine to a focus.
    • A double convex lens of cup regularly ignite combustible substances, melt metals, etc., by focusing upon them the direct sun's rays.

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