Mix thoroughly the soft shortening, sugar, and eggs. Stir in the flour, cream of tartar, soda, and salt.
Chill dough 1-2hours. Roll into balls about the size of a walnut. Roll balls in mixture of sugar and cinnamon. Place on cookie sheet and bake at 400* for 8-10 minutes till slightly browned. Cool a few minutes and put on cooling rack. Makes about 8 dozen 2 1/2 " cookies. Test immediately!