The watchmakers' lathe, its use and abuse; a story of the lathe in its various forms, past and present, its construction and proper uses (1903)
Goodrich, Ward L. [from old catalog] · Chicago, Hazlitt & Walker · leaf 194
it issmooth and within .03 MM. of the required size a fine brassor soft bell metal lap, used with diamantine and oil, willgrind and polish at the same time, making the use of otherlaps unnecessary. Originally it was thought necessary touse a steel lap charged with oilstone powder for grinding;this… … ggS Fig. 157. Webster Whitcomb Pivot Polisher. In using any of them care should be taken to keep the lapsconstantly moving forward and back in order to avoid theformation of grooves and ridges. The operator should becareful also riot to let the work get dry or a black scum willfill up the surface…
Clocks and watches · Lathes
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