30.0 MB (5.6 MB compressed)
2762 x 3795 pixels
23.4 x 32.3 cm ⏐ 9.2 x 12.7 in (300dpi)
ANN RONAN PICTURE LIBRARY / HERITAGE IMAGES / SCIENCE PHOTO LIBRARY ANN RONAN PICTURE LIBRARY / HERITAGE IMAGES / SCIENCE PHOTO LIBRARY
Puddling furnace and mechanical hammer, Krupps Works, Essen, Germany, 19th century. Pig iron is being puddled to remove carbon and oxygen, after which the ball of hot metal (bloom) was then hammered. The process was sometimes repeated. Puddling produced the purest form of iron with great strength.
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