Burning glass

A replica (on a smaller scale) of the burning lens owned by Joseph Priestley, in his laboratory

Lavoisier with French Academy of Sciences' lentilles ardentes

Close-up view of a flat Fresnel lens. These thin, light weight, non fragile and low cost lens can be used as burning-glass in emergency situations.

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.

单词	Burning glass
释义	Burning glass 英语例句库 He focused the sun's rays on a paper with a burning glass. 他用一面凸透镜把阳光聚焦在纸上。英语百科 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.
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