Now its 2019 Chapell's books are free online, downloadable as pdf
at Archive Org
They offer files made by different organizations, that are of different quality of image, depends what you like e.g, this looks like a real old book : vol 1 scanned by U of Toronto
But they also offer these bright copies by Cornell University Library Popular Music of the Olden Time vol 1
and
Popular Music of the Olden Time vol 2,