Tripoli
A gray-white or yellowish powder, which is made from the shells of microscopic organisms. It is used for polishing soft metals, first with oil, and then dry.
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.
A gray-white or yellowish powder, which is made from the shells of microscopic organisms. It is used for polishing soft metals, first with oil, and then dry.