burning glass - meaning and definition. What is burning glass
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What (who) is burning glass - definition

LARGE CONVEX LENS THAT CAN CONCENTRATE THE SUN'S RAYS ONTO A SMALL AREA, HEATING UP THE AREA AND THUS RESULTING IN IGNITION OF THE EXPOSED SURFACE
Burning-mirror; Burning-glass; Burning lens; Fire lens; Burning Glass
  • A makeshift burning glass, using the eyepiece of a [[telescope]], being used to burn a leaf.
  • Lavoisier with French Academy of Sciences' ''lentilles ardentes''}}
  • 1658 illustration depicting the sun's rays being focused to start a fire

burning-glass         
n.
Convex lens.
burning glass         
¦ noun a lens for concentrating the sun's rays on an object so as to set fire to it.
Burning glass         

A burning glass or burning lens is a large convex lens that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface. Burning mirrors achieve a similar effect by using reflecting surfaces to focus the light. They were used in 18th-century chemical studies for burning materials in closed glass vessels where the products of combustion could be trapped for analysis. The burning glass was a useful contrivance in the days before electrical ignition was easily achieved.

Wikipedia

Burning glass

A burning glass or burning lens is a large convex lens that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface. Burning mirrors achieve a similar effect by using reflecting surfaces to focus the light. They were used in 18th-century chemical studies for burning materials in closed glass vessels where the products of combustion could be trapped for analysis. The burning glass was a useful contrivance in the days before electrical ignition was easily achieved.

Examples of use of burning glass
1. When he regained consciousness, burning glass was "raining", cutting up hundreds of people — "there was a public issue launch that day" — were lying moaning or dead.
2. The poster was blamed for fueling the anger of about 500 youthful protesters whose barricade–burning, glass–breaking rampage forced the People‘s Party to move a pre–election rally from the Bundesplatz, the Federal Square in front of parliament.