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 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.
The enemy's guns were in his fancy not guns but pipes from which occasional puffs were blown by an invisible smoker.
Warmed by the spring sunshine he sat in the caleche looking at the new grass, the first leaves on the birches, and the first puffs of white spring clouds floating across the clear blue sky.
These puffs of smoke and (strange to say) the sound of the firing produced the chief beauty of the spectacle.
Her sandals raised little puffs of dust every time she put a foot down in the soft dirt.
The horse's breath made puffs of steam as she trotted along the road to the cadence of tinkling bells.
By mid-afternoon both legs were feeling tight and his breath was coming in rapid puffs each time he tackled one of the ever lengthening climbs.