Links to Institutional and Commercial Sites
--Telegraph--
--Steam-Power--
http://opensourceecology.org/wiki/Steam_Engine_Efficiency
http://www.mikebrownsolutions.com/steamart.htm
--Railroad--
--AirShips--
--Mechanical Devices--
--Electrical--
--Internal Combustion--
--Wireless--
History of Communications-Electronics in the U.S. Navy