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Preheat oven to 375°.
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Stir together flour, soda, cream of tartar and salt.
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Beat butter for 30 seconds.
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Add the 2 cups sugar and beat until fluffy.
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Add eggs, milk and vanilla; beat well.
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Add dry ingredients to beaten mixture, beating until well blended.
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Form dough into 1-inch (or larger) balls - dough will be sticky.
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Roll in mixture of cinnamon and sugar.
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Place 2-inches apart on greased cooked sheet.
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Flatten slightly with bottom of a glass.
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Bake at 375° for 8-10 minutes until light golden and just beginning to crack on top.