Mária Telkes (1900 - 1995) was a Hungarian-American scientist and inventor who worked on solar energy technologies. Her work on solar cooking starting in 1959 made her probably the first person to create a practical oven for serious daily use. Reflectors popularly known as the Telkes design which was one of the best in the series and could develop a temperature of 225° C. The box was a rectangular double-walled insulated box with a door on each side. The box had double glazing fixed at the top, and the there were four main reflectors set at an angle of 60° to the horizontal. The corner spaces between these main reflectors were fitted with four triangular mirrors. The insulated box had a cradle frame to hold the cooking vessel and to assist in tilting. The whole cooker was mounted on to an "A" type frame.