Good Day Everyone, I've read a few books and a lot of QST articles. In the older books and K2TQN's "Old Radio" department and the "75, 50 and 25 Years Ago" department of QST, I notice that they refer to Megacycles "Mc" instead of Megahertz "MHz". I'm curious as to why the change in the name and when that change came about. I know that "Hertz" came from a gentleman I believe from Germany (Heinrich Hertz) if that is correct, but not sure how or why. I don't expect a direct answer, but maybe a website that would give me some background on the subject. Thanks and 73 KC9KXW Edited for misspelled name.