The complete text of Robert Bruce Armstrongs book is contained in this window. You may read the entire book here on this page.
Alternatively you may follow this link to Armstrong's English and Irish Instruments where the digital book is hosted by www.archive.org. You may download the book in various forms on that site, including PDF and Kindle.
Please follow this Catalogue link to return to the author index on the Library page.
Armstrongs Volume 1 of "Musical Instruments", published in 1904, was entitled The Highland and the Irish Harps.