Two photos on one negative. In the photo on the left a young woman wearing a white blouse and dark pinafore, along with a rounded brimmed hat is seated on the arm of a chair. Another woman, wearing a dark colored dress with a large white collar and wearing a dark hat and her hair in ringlets is seated in the chair. In the second photo the positions of the women is reversed.
William R. Gray (Sat,) studied this question.