Tuesday, October 11, 2016
similar multiple 'galena crystal detectors,' originally situated in the Great Pyramid's Grand Gallery, were the most important components capable of rectifying electromagnetic energy received by the pyramid-shaped 'antenna.' Due to this extraordinary property of these galena crystals, it requires no power source and were therefore used in the first passive radio receivers in the late 19th and early 20th century. Such a component, acting as a semiconductor crystal, is now called a diode. Galena mines were found in the Egyptian eastern desert. Eye make-up in Ancient Egypt was made of black 'kohl' extracted from galena. Besides cosmetics, it had a spiritual and healing aspect.