div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=the-propagation-of-radio-waves-over-the-earth-57984fe3b7b51htmlpage=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:reader031vdocumentsusreader031viewer2022020522575067bf1a28ab0f07acf46ahtml5thumbnails1jpg width=140 height=200 divp© 1925 Nature Publishing Grouppdivdiv class=ts-pagebutton class=gotoPage data-page=2Page 2button div class=ts-imageimg data-url=the-propagation-of-radio-waves-over-the-earth-57984fe3b7b51htmlpage=2 data-page=2 class=ts-thumb lazyload alt=Page 2: The Propagation of Radio Waves over the Earth loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentsusreader031viewer2022020522575067bf1a28ab0f07acf46ahtml5thumbnails2jpg width=140 height=200 divp© 1925 Nature Publishing Grouppdiv