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32.3 x 23.4 cm ⏐ 12.7 x 9.2 in (300dpi)
ANN RONAN PICTURE LIBRARY / HERITAGE IMAGES / SCIENCE PHOTO LIBRARY ANN RONAN PICTURE LIBRARY / HERITAGE IMAGES / SCIENCE PHOTO LIBRARY
Interior of Marston Salt Mine, Northwich, Cheshire, England, c1880. This shows how pillars of rock have been left to support the roof. At this date (1880) the mine had been excavated to a height of 16 ft (5m) over approximately 40 acres (more than 16 hectares). From Science for All by Robert Brown.
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