emirrors thus made are highly polished with the surfacessufficiently plane to produce satisfactory images of thespot of light. The dimensions of the mirrors so far pro-duced are approximately 5 L> mm. wide, 1% mm. long, and.10 to .20 mm. in thickness. Care must be taken not touse too much… … 556 AUTOMOTIVE INDUSTRIESTHE AUTOMOBILE March 10, 1921 Rust Prevention by Browning Process Has been used extensively for many years for treating component partsof small arms. Produces a bluish black finish which is rendered dullby sand blasting or may be polished by buffing. Finish does not ruboff,…
Automobiles · Aeronautics
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