Why are Anvils Shaped as They Are and Why Do Blacksmiths Tap the Anvil After a Few Strikes?

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In this video:

Anvil shape has evolved greatly since the earliest anvil-like objects. These primitive objects used for anvils were typically made of stone, often just a slab of rock. The first metal anvils were made of bronze, then wrought iron, and, finally, steel, which is the material of choice today for anvils, though cast iron is also used in low-end anvils (cast iron is quite brittle for this particular use and absorbs more of the hammer blow’s energy than steel does, so it is not preferred).

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Sources:

   • how to use an anvil  
  / is_there_a_reason_anvils_are_shaped_the_wa...  
http://boards.straightdope.com/sdmb/a...
http://www.howstuffworks.com/iron.htm
http://en.wikipedia.org/wiki/Anvil
http://en.wikipedia.org/wiki/Farrier
http://en.wikipedia.org/wiki/Blacksmith
http://en.wikipedia.org/wiki/Steel
http://en.wikipedia.org/wiki/Cast_iron
http://en.wikipedia.org/wiki/Iron
http://en.wikipedia.org/wiki/Wrought_...
http://en.wikipedia.org/wiki/Pig_iron
http://en.wikipedia.org/wiki/Anvil_fi...
http://en.wikipedia.org/wiki/File:Anv...
http://en.wikipedia.org/wiki/File:3_t...