He could see puffs of musketry smoke that seemed to chase one another down the hillsides, and clouds of cannon smoke rolling, spreading, and mingling with one another.
Where the carbon, in thus diffusing inwards, meets particles of the slag, a basic ferrous silicate which is always present in wrought iron, it forms carbonic oxide, FeO+ C = Fe+CO, which puffs the pliant metal up and forms blisters.
The enemy's guns were in his fancy not guns but pipes from which occasional puffs were blown by an invisible smoker.
Her sandals raised little puffs of dust every time she put a foot down in the soft dirt.
The ebullition from the formation of carbonic oxide puffs up the resultant phosphoric slag enough to make most of it run out of the furnace, thus both removing the phosphorus permanently from danger of being later deoxidized and returned to the steel, and partly freeing the bath of metal from the heat-insulating blanket of slag.