Mix flour with sugar, salt, cream of tartar, soda and cinnamon. Cream butter to soften. Add flour mixture, milk and vanilla. Mix until all flour is moistened; then beat 2 minutes at medium speed of electric mixer, scraping bowl occasionally. Add eggs and chocolate. Beat 1 minutes longer. Pour batter into 10 inch fluted or straight sided tube pan which has been greased and floured. Bake at 325 degrees about 1 hour and 20 minutes, or until cake tester inserted into center of cake comes out clean. Cool in pan 15 minutes. Remove from pan and finish cooling on rack. Sprinkle with confectioners sugar and top with chocolate glaze.
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