Geometric figures25/2 1917
February 1917Translation
[No written text beyond diagram labels: the letters "a" and "p" mark points on a cylindrical figure in the first drawing; the second drawing shows a similar cylinder with an oval shape below, partly outlined in red.]
Original (Swedish)
[hint: diagram med bokstÀverna "a" och "p" markerade pÄ en cylinderformad figur] [hint: andra diagrammet visar en liknande cylinder med en oval nedtill, delvis rödmarkerad]