http://online.wsj.com/article/SB10001424052970203430404577093872426329082.html People line up to withdraw cash at an automatic teller machine (ATM) in Latvia's capital Riga following a banking panic apparently caused by rumors on the Twitter social media network.
http://www.macmillandictionary.com/dictionary/american/ATM ATM
automated teller machine: a machine outside a bank or in a public place that you use to take money out of your bank account
ATM is the abbreviation for "automated teller machine," isn't it?
Why would it be correct to say "automatic teller machine" instead of "automated teller machine"?