Firing temperatures and what they mean

Orton Standard cones were created by the English. Each cone number coresponds to a temperature. It starts with cone 022 and counts backwards to cone 01 and then counts forward again from cone 1 to cone 15.
cone 022 - Fahrenheit 1121...................... the clay dehydrates.
cone 018 - Fahrenheit 1328.......................over glaze or enamels mature
Cone 015 - Fahrenheit 1481......................glass slumps
Cone 012 - Fahrenheit 1607......................luster glazes mature
cone 09 - Fahrenheit 1706......................low fire lead glazes mature
cone 07 - Fahrenheit 1815......................low fire earthenware glazes mature
cone 06 - Fahrenheit 1845...................... native and red clays mature, raku
cone 02 - Fahrenheit 2055......................buff colored clays mature, high fired earthenware
cone 2 - Fahrenheit 2130.....................soft stoneware vitrifies
cone 4 - Fahrenheit 2174......................china glazes
cone 6 - Fahrenheit 2245......................soft feldspar glazes mature
cone 8 - Fahrenheit 2300.....................Stoneware clay matures, Salt glazes
cone 9 - Fahrenheit 2345......................Stoneware glazes
cone 10 - Fahrenheit 2381...................... Hard stoneware
cone 11 - Fahrenheit 2417......................porcelain begins to vitrify
cone 13 - Fahrenheit 2465......................Porcelain matures, porcelain glazes mature