PT Journal AU Kratky, J SO Pruzkumy pamatek PY 2018 BP 103 EP 112 VL 25 IS 1 DI 10.56112/pp.2018.1.07 WP https://pruzkumypamatek.cz/en/artkey/prp-201801-0007.php DE Pipe organ; history of pipe organ making; Rieger; Silesia; cone valve chest SN 12121487 AB In 1843, the founder of Krnov pipe organ company, Franz Rieger (1812-1885), who worked in Sosnova, proposed construction of a new pipe organ with twelve registers (see Appendix no. 1). Although this proposal did not materialise, in 1873 Franz Rieger and his son provided a description of the current pipe organ along with the realised proposal for the construction of a new pipe organ with cone valve chests (see Appendix no. 2). Marked as the second opus of the Rieger Company in Krnov, this pipe organ has survived without major changes and represents a milestone in the development of the pipe organ production because of its status as the first remaining pipe organ with cone valve chests produced in the Czech lands. ER