C. Van Noorden, Freak Pianos (1901)

http://www.geocities.com/threesixesinarow/freak.htm

Maybe omitting Zumpe's, Koennicke's or Maelzel's pianos, as well as
Clagget's, Hawkins', Becker's, Loeschman's, Shaws', and Ward's
patents, was tacit approval.

Here's some international sites with nice pictures showing different
perspective about old pianos.

http://www.hammerfluegel.net/

http://www.musiques-vivantes.com/index.php?
option=com_content&task=view&id=5&Itemid=6

http://stockholm.music.museum/samlingar/detalj.php?
l=sv&mmcss=l&iid=213&v=20050112214901 (there's two current
dissertations about the maligned downstriking piano (http://www.music.
indiana.edu/ddm/index.html) and Borgato makes one for a pedal piano)