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Preheat oven to 400 degrees
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In a large bowl, add 1 1/2 cups sugar, butter, shortening, eggs and vanilla
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Beat on medium speed with an electric mixer until creamed
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Reduce speed to low and add flour, cream of tartar, baking soda and salt
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Beat until just combined, being certain to scrape bottom of bowl often
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Combine remaining 1/4 cup sugar and cinnamon in a small bowl; set aside
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Roll cookie dough into 1-inch balls
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Roll in cinnamon and sugar mixture and place 2 inches apart on an ungreased cookie sheet
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Bake at 400 degrees for 8-9 minutes, or until edges are just starting to brown
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Cool on wire rack. Store in airtight container
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Use or freeze within one week.