They were mainly used for organists to practise on, but pulling the notes by wires like this would be a poor way of playing piano notes.
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If you find old references or links on this site to pianogen.org, they should refer to pianohistory.info
His work seems to have been accomplished with choppers and penknives and many drills.. It plays quite nicely now.
Any fool can make a piano-- it needs a tuner to put the music in it
I know the history and purpose from the pedal clavichords to the modern pedal grand pianos and was just interested to know if Challen had this uprigth in the production line. After all, there is quite a lot of new music written for this type of piano.