The Pernot Rotary Puddler

1875 Scientific American  
The new puddling furnace represented herewith has its characteristic feature in an inclined hearth, not more than one half of which is ever covered by the molten metal. This modification, it is stated, has given important advantages, as the higher part of the hearth forms a rapidly oxidizing sur face for the thin layer of metal by which, because of adhe sion and by centrifugal force, it is constantly covered,
doi:10.1038/scientificamerican02061875-82 fatcat:rqzwneyxzjaszgkjdzq6jodvia