div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=the-propagation-of-radio-waves-over-the-earthhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: The Propagation of Radio Waves over the Earth loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader036vdocumentsnetreader036viewer2022073015575067be1a28ab0f07acf3bbhtml5thumbnails1jpg width=140 height=200 divp©1925 Nature Publishing Grouppdiv