Mix butter, sugar, and eggs thoroughly.
Sift together flour, cream of tartar, soda, and salt.
Stir into mixture.
Form into balls the size of a walnut.
Roll balls in mixture of 2 T sugar and cinnamon.
Place about 2 inches apart on an ungreased baking sheet.
They puff up during baking but settle down and look sugary and crinkly.
Bake at 400 deg for 8-10 min.
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