The Collaborative International Dictionary
Burning \Burn"ing\, n. The act of consuming by fire or heat, or of subjecting to the effect of fire or heat; the state of being on fire or excessively heated.
Burning fluid, any volatile illuminating oil, as the lighter petroleums (naphtha, benzine), or oil of turpentine (camphine), but esp. a mixture of the latter with alcohol.
Burning glass, a convex lens of considerable size, used for producing an intense heat by converging the sun's rays to a focus.
Burning house (Metal.), the furnace in which tin ores are
calcined, to sublime the sulphur and arsenic from the
pyrites.
--Weale.
Burning mirror, a concave mirror, or a combination of plane mirrors, used for the same purpose as a burning glass.
Syn: Combustion; fire; conflagration; flame; blaze.
Wikipedia
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.
Usage examples of "burning glass".
When Pelzed came out, he had a new burning glass and was very proud.
In my hand I held the burning glass taken from the pocket in my belt.
In each hand she held a knife, and those knives shone as if their blades were made of burning glass.
Second is the acquisition of various materials and tools which you will be unable to make or grow in a sudden, synthetic stone age- items such as a pickax or a burning glass, for example, will be wdrth considerably more than two college degrees or a diamond bracelet.
Second is the acquisition of various materials and tools which you will be unable to make or grow in a sudden, synthetic stone age - items such as a pickax or a burning glass, for example, will be worth considerably more than two college degrees or a diamond bracelet.