Three helmets from the late 15th century. A kettle hat in the middle; a sallet with visor at left; and a visored helmet decorated with flames at right. Chromolithograph from Hefner-Alteneck's 鈥楥ostumes; Artworks and Appliances from the early Middle Ages to the end of the 18th Century;' Frankfurt; 1883. IIlustration drawn by Hefner-Alteneck; lithographed by C. Regnier; and published by Heinrich Keller. Dr. Jakob Heinrich von Hefner-Alteneck (1811-1903) was a German archeologist; art historian and illustrator. He was director of the Bavarian National Museum from 1868 until 1886.