BLOCK SYSTEM
Block system. (Railroads)
Defn: A system by which the track is divided into short sections, as of three or four miles, and trains are so run by the guidance of electric, or combined electric and pneumatic, signals that no train enters a section or block until the preceding train has left it, as in absolute blocking, or that a train may be allowed to follow another into a block as long as it proceeds with excessive caution, as in permissive blocking.
BLOCK TIN
Block" tin` (.
Defn: See under Tin.
BLOEDITE
Bloe"dite, n. Etym: [From the chemist Blöde.] (Min.)
Defn: A hydrous sulphate of magnesium and sodium.
BLOLLY Blol"ly, n. (Bot.) (a) A shrub or small tree of southern Florida and the West Indies (Pisonia obtusata) with smooth oval leaves and a hard, 10-ribbed fruit. (b) The rubiaceous shrub Chicocca racemosa, of the same region.
BLOMARY
Blom"a*ry, n.
Defn: See Bloomery.
BLONCKET; BLONKET Blonc"ket, Blon"ket, a. Etym: [OF. blanquet whitish, dim. of blanc white. Cf. Blanket.]