Burning-glass



a converging lens used to produce heat or ignite substances by focusing the sun’s rays.
Historical Examples

The Boy’s Playbook of Science John Henry Pepper
Stories of Invention Edward E. Hale
A Handbook of Health Woods Hutchinson
The White Scalper Gustave Aimard
The Man in Lower Ten Mary Roberts Rinehart
Myths And Legends Of Our Own Land, Complete Charles M. Skinner
An Introduction to the History of Science Walter Libby
Great Inventions and Discoveries Willis Duff Piercy
Black Diamonds Mr Jkai
Six Lectures on Light John Tyndall

noun
a convex lens for concentrating the sun’s rays into a small area to produce heat or fire

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  • Burning-question

    An urgent or crucial issue under heated discussion. For example, Real estate taxes are always a burning question for the town leaders. This term has exact equivalents in French (question brûlante) and German (brennende Frage). [ Mid-1800s ] Contemporary Examples Is Jay Leno Facing Another NBC Coup in Favor of Jimmy Fallon? Howard Kurtz March […]

  • Burnish

    to polish (a surface) by friction. to make smooth and bright. Engraving. to flatten and enlarge the dots of (a halftone) by rubbing with a tool. gloss; brightness; luster: the burnish of brass andirons. Contemporary Examples Nevada Guv Faces Fans and Foes in Reelection Lloyd Green March 17, 2014 What’s Palin Doing in Israel? Dan […]



  • Burnished

    to polish (a surface) by friction. to make smooth and bright. Engraving. to flatten and enlarge the dots of (a halftone) by rubbing with a tool. gloss; brightness; luster: the burnish of brass andirons. Contemporary Examples Revenge of the Nerds Peter Beinart December 7, 2008 Welcome to Woolwich, Where English Terrorists Say Sorry While They […]

  • Burnisher

    a person who burnishes. a tool, usually with a smooth, slightly convex head, used for polishing, as in dentistry. Historical Examples Writing & Illuminating, & Lettering Edward Johnston The Tale of Timber Town Alfred Grace Cooley’s Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades…, Sixth Edition, Volume I Arnold […]



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