Metallic Arc:- MICROSCOPE » MICROSCOPE ACCESSORIES » Metallic Arc Metallic Arc – Scientific Equipment Complete with Reflector Narc lamp or arc light is a lamp that produces light by an electric arc The carbon arc light, … A mercury arc lamp from a fluorescence microscope. … The term is now used for gas discharge lamps, which produce light by an arc between …. Flame arc lamps were introduced where the carbon rods had metal salts