SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Smelting furnace. Diagram for a design of smelting furnace drawn by Mikhail Lomonosov (1711-65), Russian polymath. This design is 'self-inflating', meaning that it creates a draught that fans the fire. The hotter the fire, the greater the draught. This means the fire burns considerably hotter than in a conventional furnace.
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