Diamond Files
Strips of copper into the face of which diamond powder of various degrees of coarseness has been hammered or rolled. Used for working ruby-pallets and other hard stones and hard steel.
How to true a balance, repair a chipped dial, temper a spring or test a stone — the working bench-book of the American watch trade, arranged A to Z.
Strips of copper into the face of which diamond powder of various degrees of coarseness has been hammered or rolled. Used for working ruby-pallets and other hard stones and hard steel.