Just the other day, soon after I posted the stop list of the so called Bach Organ at Christ the King in this thread site, I pulled it because of not being so sure about certain figures regarding the tin-lead ratios. But I think I can re-attach it again for reference. The tin-lead ratios and their percentages somewhat indicate what flues are to be deemed closer to principal tone, and what are to be made as a flute, particularly when deciding on the materials to be used in Mixtures and high-pitched mutation stops.
The appellation is used to describe an instrument similar to those that Bach knew and played. There are many possibilities for such a Bach Organ, ranging from North German organs such as those built by Arp Schnitger in the late 17th century to the organs of Thuringia and Saxony to the east in Central Germany. The choice of a Saxon-style organ flowed from a series of preferential considerations, and not from any judgment as to what makes the best Bach Organ.
Gottfried Silbermann (1683-1753) was the best known Saxon organ builder during the time Bach was at St. Thomas Church in Leipzig (now the sister city to Houston). Zacharias Hildebrandt (1688-1757) was his pupil, then his associate, and later an independent builder. Bach and Silbermann, for example, jointly inspected and approved an organ built by Hildebrandt in Naumburg. While a number of organs have been built in America in the style of Schnitger, to date only a few emulate Silbermann, and none is known to follow Hildebrandt. The organ at Christ the King Church follows the example of Hildebrandt, thus adding a Bach Organ of a new dimension on the North American continent.
Fritz Noack and the
Noack Organ Company were selected to design and build the organ. Noack is an American builder born and trained in Germany and uniquely situated to bridge the Saxon past and the Texan present. Kristian Wegscheider of Dresden, restorer of important Silberman organs, accepted appointment as a design consultant; Reinhard Schabitz of Dresden, voicer in the restorations, assisted in the voicing; and most of the metal pipes were built near Dresden in the workshop of Günter Lau.
Hauptwerk (lower manual, C-f''' = 54 notes)
- Bordun 16' 54 pipes 18 pine, rest 85% lead
- Principal 8' 54 pipes 90% tin, front
- Viola di Gamba 8' 54 pipes 90% tin
- Rohrflöte 8' 54 pipes 12 pine, rest 85% lead
- Octava 4' 54 pipes 90% tin
- Spitzflöte 4' 54 pipes 90% tin
- Quinta 2-2/3' 54 pipes 90% tin
- Octava 2' 54 pipes 90% tin
- Mixtur III 162 pipes 90% tin
- Cimbel II 108 pipes 90% tin
- Cornet III c' 90 pipes 85% lead
- Trompete 8' 54 pipes 90% tin, brass shallots, metal boots
- Vox Humana 8' 54 pipes 90% tin, brass shallots, metal boots, not playable in Pedal
Oberwerk (upper manual, C-f''' = 54 notes)
- Gedackt 8'54 pipes 12 pine, rest 85% lead
- Quintadena 8' 54 pipes 90% tin
- Principal 4' 54 pipes 90% tin, front
- Rohrflöte 4' 54 pipes 85% lead
- Nasat 2-2/3' 54 pipes 85% lead (as Rohrflöte)
- Octava 2' 54 pipes 90% tin
- Waldflöte 2' 54 pipes 90% tin
- Terz 1-3/5' 54 pipes 90% tin
- Quinta 1-1/3' 54 pipes 90% tin
- Sifflet 1' 54 pipes 90% tin
- Krummhorn 8' 54 pipes 90% tin, brass shallots, metal boots
Pedal (C-f' = 30 notes,flat)
- Principal Baß 16' 30 pipes 6 pine, open, rest 90% tin, front
- Subbaß 16' 30 pipes pine
- Octaven Baß 8' 30 pipes pine
- Octava 4' 30 pipes 90% tin
- Posaunen Baß 16' 30 pipes pine, cast lead shallots
- Trompete 8' 30 pipes 90% tin, cast lead shallots
Couplers
Oberwerk to Hauptwerk (shove coupler)
Hauptwerk to Pedal (separate pallets in Hauptwerk)
Manual naturals covered with ebony, sharps with bone
Attached keydesk, with doors
Case from Eastern white pine, painted
Mechanical action throughout
Temperament: Neidhardt I
Tremulant
Zimbelglöcklein
Vogelgesang
Carved pipe shades
One wedge-shaped bellows
Source:
http://www.bachsocietyhouston.org/organ.htm
Several musical excepts from this organ can be heard:
http://www.bachsocietyhouston.org/organaudio.htm.