For the dressing of the faces of grindstones, special forms of cutting machines have been devised. 威廉·亨利·杜利特.世纪发明.
Shipments were growing larger, and materials like grindstones, bought outside, had to be brought from the canal to Ilion Gulph. 佚名.神奇的知识之书.
The power was taken from a water wheel in Steele’s Creek, and the first grindstones for smoothing down the welded edges in gun barrels were cut from a red sandstone ledge up the gorge. 佚名.神奇的知识之书.