burning glass
Concise Oxford English Dictionary © 2008 Oxford University Press:
burning glass
▶noun a lens for concentrating the sun's rays on an object so as to set fire to it.
'burning glass' also found in these Oxford entries:
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burning glassConcise Oxford English Dictionary © 2008 Oxford University Press: burning glass ▶noun a lens for concentrating the sun's rays on an object so as to set fire to it. 'burning glass' also found in these Oxford entries:
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