Oil Refining (CTP1)

Oil Refining is an advance in Civilization: Call to Power.
==Summary==
Oil Refining, the sixth Mechanical Advance, opens the door to the power of oil and gas. Besides gaining the Oil Refinery, which increases production, Civilizations also gain the Submarine, a critical weapon of sea warfare.
== Great Library entry ==
During the late 18th century, the first petrochemical substance was discovered. Found by Edwin Drake at Oil Creek, PA, in 1859, oil was first used exclusively as lamp fuel. Within twenty years, scientists had developed their refining technique to the point that crude gasoline could be produced from oil. However, the world awaited a use for gas - and Nikolaus Otto was about to provide it.