STEAM NAVIGATION.
Propulsion by paddle-wheels. -- Manner of driving them. -- Marine
Engine. -- Its form and arrangement. -- Proportion of its
cylinder. -- Injury to boilers by deposites and incrustation. --
Not effectually removed by blowing out. -- Mr. Samuel Hall's
condenser. -- Its advantages. -- Originally suggested by Watt. --
Hall's _steam saver_. -- Howard's vapour engine. -- Morgan's
paddle-wheels. -- Limits of steam navigation. -- Proportion of
tonnage to power. -- Average speed. -- Consumption of fuel. --
Iron Steamers. -- American steam raft. -- Steam navigation to
India. -- By Egypt and the Red Sea to Bombay. -- By same route to
Calcutta. -- By Syria and the Euphrates to Bombay. -- Steam
communication with the United States from the west coast of
Ireland to St. Johns, Halifax, and New York. 241