The watchmaker's graver is a tool that is used on the precision lathe for doing delicate & very precise turning, to within one hundredth of a millimeter or in that range. So, this book should contain as the title states how to use these tools, sharpen, hone, grind, & polish, to a very sharp edge. Barkus made a graver out of Carbolly as they called it, the material held it's edge sharpness longer than a high carbon tool steel, but it is brittle & chips very easy. So with out digging around for several hours through my library to find my article by the BARKUS MFG, I will guess a high likelihood this is in this book how to care for & use their product. The tool requires a diamond lap & diamond wheel to sharpen. Best In Life! MJR 6 DELTA LS