LEAD n. 3 definitions
A small cylinder of black lead or plumbago, used in pencils. Black lead, graphite or plumbago, ; -- so called from its leadlike appearance and streak. [Colloq.] -- Coasting lead, a sounding lead intermediate in weight between a hand lead and deep-sea lead. -- Deep-sea lead, the heaviest of sounding leads, used in wate…
MAGNESIUM n.
arnishing in moist air. It burns, forming (the oxide) magnesia, with the production of a blinding light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbo…