ps5s1.txt

MIT公开课程,包括麻省理工算法课程的教师用书（包含习题答案！！！！！！！！）

The first practical mechanized type casting machine was invented in
1884 by Ottmar Mergenthaler. His invention was called the
"Linotype". It produced solid lines of text cast from rows of
matrices. Each matrice was a block of metal -- usually brass -- into
which an impression of a letter had been engraved or stamped. The
line-composing operation was done by means of a keyboard similar to a
typewriter. A later development in line composition was the
"Teletypewriter". It was invented in 1913. This machine could be
attached directly to a Linotype or similar machines to control
composition by means of a perforated tape. The tape was punched on a
separate keyboard unit. A tape-reader translated the punched code into
electrical signals that could be sent by wire to tape-punching units
in many cities simultaneously. The first major news event to make use
of the Teletypewriter was World War I.