I have been unable to find a picture of the Apollo Lyre (or Apollo Lyra) and information about it is both scarce and a little contradictory. It is said to have been invented in 1831, or 1832, by Leopold Schmidt of Heiligenstadt (home of Johannes Weinrich, inventor of the psallmelodikon). It is reported to have been an improved version of the psallmelodikon, made in the shape of a lyre, the free reeds contained within it sounded by means of a blowpipe. It is said to have had six fingerholes and 42 keys, with a four octave range.
A Brief History of Mouth Blown Free Reed Instruments
What Is A Free Reed?
Origins Of The Free Reed
Eastern Free Reed Instruments
A Selective Discography Of Asian Free Reed Instruments
Western Free Reed Instruments
Bibliography