burning glass - definition. What is burning glass
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%ما هو (من)٪ 1 - تعريف

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.

ويكيبيديا

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.

أمثلة من مجموعة نصية لـ٪ 1
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.