National Geographic : 1951 Dec
© National Geographic Society 4 Photographing the Shape of Jet Flame Helps Design Better Engines The Bureau uses such pictures in fundamental re search on improving the performance of jet power plants. It is also developing ceramic materials to with stand jet-engine temperatures, which range up to 4,0000 Fahrenheit. Most metals melt in such heat. r.KtacromeS Dy i tllTar( I. (t lver 4 "Mud" Becomes Solid and Strong under the Touch of Magnetism Magnetic fluid, a mixture of oil and iron particles in vented at the Bureau, is used to operate a new type of clutch for large machines. Here two thin gray layers of the material tightly hold the yellow strip supporting the 50-pound weight. Right: Magnet solidifies fluid.