Christ Episcopal (Old North) Church, Boston, Mass. 1756 Thomas Johnston organ GREAT: Open Diapason Stopt Diapason Principal Twelfth Fifteenth Sesquialter III ranks Trumpet SWELL or ECHO: Stopt diapason Principal Flute Trumpet "The three first stops of the swell were carried through in the bass, outside of the swell box, and thus formed a choir-organ and swell combined." [Received from John Speller 2013-05-20.]