About that tetrahedral kiss: Was it really Mabel?

Yesterday I posted a photo from National Geographic's new Tumblr feed showing Alexander Graham Bell leaning in to kiss a woman who was holding herself inside one of his iconic tetrahedral kite frames. Both the National Geographic and I identified the women as Bell's wife, Mabel Gardiner Hubbard. Not so, writes Contrarian reader Donna Johnson, who works at the Bell Museum* in Baddeck: This is one of my favourite photos. Also a favourite of the visitors, who are sometimes a bit disappointed when we point out that, contrary to popular opinion, this is actually Bell kissing his daughter Daisy, not Mabel. If you...