Another consideration is the relationship. between insulation class, temperature rise, and ambient temperature. The insulation. class rating designates the maximum. operating temperature for a winding. The. temperature rise is the difference between the.
China claims it has discovered the world's largest hole, and it's in one of the most dangerous places on the planet. 1  Jul.  Good news: China claims it has discovered the world's largest hole. On Wednesday, state broadcaster CCTV announced that the newly found dragon's hole, a 984-foot (300-meter) cavern in the disputed waters of the South China Sea, is now the world's largest hole.
The diamond that takes first place is the Sergio. This rock was found in Brazil in 1895 and weighs 3,150 carats (about 1.4 pounds) making it the largest uncut diamond in the world. The Sergio is even more interesting because of its color, a rare black. Black diamonds like the Sergio are believed to have their origins in meteorites. Cullinan