Special Pictures

WHAT'S THAT ???
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© W. Kaspar-Sickermann

black cylinder, punched

in the picture: one cylinder
BEFORE use

brown cylinders, punched

in the picture: three cylinders
AFTER use

SCROLL SLOWLY! YOU'LL GET A HINT

black punched cylinder in use

... IN use

WELL ?

stove with Briquette of lignite

Correct! Briquette of lignite in a stove, Yunnan, South China