Image of a claviharp, a keyboard and harp combined. Posted at "<a rel="nofollow" class="external free" href="http://chestofbooks.com/crafts/scientific-american/sup6/The-Clavi-Harp.html">http://chestofbooks.com/crafts/scientific-american/sup6/The-Clavi-Harp.html</a>" from a 1891 source:
<dl><dd>Title	Scientific American Supplement Volumes 643, 647, 664, 711, 717, 787, 794, 795, 799 and 803</dd>
<dd>Author	Various Authors</dd>
<dd>Publisher	Munn &amp; Co.</dd>
<dd>Year	1888-1891</dd>
<dd>Copyright	1891, Munn &amp; Co.</dd></dl>
Various Authors
Scientific American Supplement Volumes 643, 647, 664, 711, 717, 787, 794, 795, 799 and 803