Original image description from the Deutsche FotothekMechanik & Musikinstrument & Wasserorgel & Tremulant Public domain scan of 17th-century scientific illustration, free to use, no copyright restrictions imag More
Original image description from the Deutsche FotothekMechanik & Musikinstrument & Orgel & Tremulant Public domain scan of 17th-century scientific illustration, free to use, no copyright restrictions image - Pi More