div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imagea href=https:reader043vdocumentssitereader043viewer20220202025750678a1a28ab0f07abff81html5page1jpg target=_blank img data-url=the-microphone-as-a-receiverhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: The Microphone as a Receiver loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader043vdocumentssitereader043viewer20220202025750678a1a28ab0f07abff81html5thumbnails1jpg width=140 height=200 adivp© 1878 Nature Publishing Grouppdiv