(j l, joul) (KEY) , 1818–89, English physicist. His scientific researches began in his youth when he invented an electromagnetic engine. Joule made ...
(zh rwä´) (KEY) , river, c.1,500 mi (2,410 km) long, rising in the Cerros de Canchyuaya, E Peru. It flows in a winding course generally NE through A...
system of astronomical dating that allows the difference between two dates to be calculated more easily than conventional civil calendars with their u...
(y l´y r) (KEY) , pass, 7,504 ft (2,287 m) high, Grisons canton, SE Switzerland, connecting the Upper Engadine Valley to the Oberhalbstein Valley. Us...