div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imagea href=https:reader042fdocumentsinreader042viewer2022020522575067891a28ab0f07abfc9dhtml5page1jpg target=_blank img data-url=documenthelmholtzs-vowel-theory-and-the-phonograph-57962cb5b753ahtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: Helmholtzs Vowel Theory and the Phonograph loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader042fdocumentsinreader042viewer2022020522575067891a28ab0f07abfc9dhtml5thumbnails1jpg width=140 height=200 adivp© 1878 Nature Publishing Grouppdiv