Preheat oven to 350

Mix butter, sugar and eggs thoroughly in large bowl.

Combine flour, cream of tartar, salt, and baking soda in a separate bowl.

Blend dry ingredients into butter mixture.

Chill dough and increased cookie sheet in fridge for 10-15 mins.

Meanwhile mix sugar and cinnamon in small bowl.

Scoop 1in globs of dough into sugar/cinnamon mixture.

Coat by gently rolling dough in sugar/cinnamon mixture.

Place on chilled cookie sheet and bake for 10 mins.

Remove from pan immediately.