Turning Hard Steel with the Aid of Petroleum as a Lubricant

Abstract

An amalgamated silver mirror does not exhibit the yellow shade of pure silver, is far lQSS sensitive to sulphuretted hy llroszen, as two years' experience proved, and resists perfect ly the action of the !:!un. Lenoir's process has been intro duced into the mirror factory of Mangin l.el'llr, at Paris. Deutsc1le industrie Zeitltng. A Sln!;ulllr Rallway CollltIJlon.