The five pictures illustrate various features of the John Lyon fortepiano.
1. With respect to outward appearance, the sharps are covered with bone and the case done with exotic woods.
2. Mr. Lyon originally intended the piano to remain in his possession -- English walnut for the lid, American burl walnut veneer above the keyboard, Circassion walnut veneer on the exterior of the case, and French walnut veneer on the interior.
3 & 4. The pictures of the action show the backchecks, the capsules and hoppers.
5. The sheepskin covering of the hammer produces a bright sound in the fortepiano but is unsuitable for the 1816 Broadwood.
Quoting Steven Manley, a technician who worked with John Lyon in the construction and who is now an attorney in Lansing, "The purpose for the "cut-off bar" [lying diagonally across the left segment of the soundboard] is to deflect sound energy from a dead corner to a lively part of the soundboard. That is one of the special, if not unique, features of the Mozart piano, by the way. You won't find it on many, old or new, fortepianos. On Mozart's the bar itself performed that function as best it could without help from any other structure, but John took the concept to its logical extreme and apparently anchored the thing to the floor."