Bourdon, 16’, or 8’ stopped , is an organ stop whose longest pipe speaks C two octaves below middle C and is eight feet long, which is equivalent to 16’ open, in unison with a stopped eight-foot pipe. This stop has three octaves of wood pipes and the treble octave of lead. See [Plate VII] fig. 30, showing a wooden bass pipe and a lead treble pipe. The wooden pipes consist of four boards joined with tongue and groove and securely glued, as shown in [Plate IX] fig. 52 ; [in Plate VII, fig. 30.1] b is the mouth, 3 the lower lip, 4 or 0  [1] the upper lip; [in fig. 52] A is the foot, B the chamber, C the languid, and E the stopper, which is inserted in the pipe for tuning. Fig. 30 no. 2 shows a lead treble pipe: in both figures, a is the foot, c the mouth, d the ears for tuning, e the cross-section of the pipe; b is the languid, with the bevel facing up; f the cap soldered on to stop the pipe. As for dimensions of the parts, the pipe length should be about ten times the diameter, so the eight-foot pipe should be 9 inches square internally. Note that the length of the pipe is measured from the upper surface of languid c to the lower surface of stopper E , and that the height of chamber B and the length for adjusting stopper E must be added to that measurement. All Bourdon pipes must follow precisely the measurements on the scale. See Scale, the article Organ, and the table of compasses of organ stops [Plate XI, fig. 67].

1. The original has no “4” (Translator’s note).