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Make sure all ingredients are at room temperature. Preheat oven to 325 degrees. Grease and flour two 9 x 5-inch loaf pans.
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Beat butter in a large bowl at medium high speed for one minute.
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Gradually add and beat sugar 5 to 7 minutes.
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Beat in eggs yolks one at a time
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Add in vanilla and beat for one minute.
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On low speed,slowly add sifted flour and mix only until thoroughly blended.
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Using clean beaters, beat egg whites, cream of tartar and salt at medium high speed until stiff but not dry.
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Fold one quarter of the whites into the batter, then fold in the remaining whites. Scrape the batter into the pans. Bake the cake until a toothpick inserted into the center comes out clean, about one hour.
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Cool pans on a rack for 10 minutes. Enjoy.