Sift flour once, measure.

Combine baking powder, salt and eggs in bowl.. Place over smaller bowl of
hot water, and beat with rotary egg beater, adding sugar gradually until
mixture becomes thick and light-colored. Remove bowl from over hot water.

Fold in flour and vanilla.

Pour into pan, 13 1/2x 8 1/2 inches, lined with greased paper.

Bake in hot oven (400 degrees) 13 minutes.

Turn from pan at once onto cloth covered with powdered sugar.

Remove paper.

Quickly cut off crisp edges of cake.

Spread with jelly and roll.

Wrap in cloth until cool.