a tribute to SAX

BORE PROFILE


Sax uses three consecutive and each time narrower conicities. But the mutual arrangement of these conicities shows variety. On the basis of our own considerations we make a choice within this framework.

in practice

For the construction of the instrument we use the adapted parts of an existing saxophone. The bell has a width which, when compared to the smaller third conicity of the right hand, promises to fit nicely to a greater instrument length (for this see the sheet with the bore profiles). Therefore we decided to extend the instrument to a (written) low A. In his third patent Sax also mentions lengthening the instrument, even up to a written low Ab, but he never realised such plans.

Short and wide bows always entail complications. Although these complications can be compensated for, we decided not to follow this path and to make the instrument straight, so that we have a perfect certainty as to the effect of the chosen profile. It's true, the choice for a straight alto in Eb to a low A is not a conventional but still a defensible one (also in view of Sax's statement that a wind instrument can be folded to our liking but that it better be straight..) and as far as dimensions go, such an instrument can still be handled.

design

Four different possibilities have been scanned. In order to come as close as possible to the parabolic cone, we try to give the consecutive conicities each time a greater proportion of the instrument length. The golden section proportion, which Sax more or less approximates in both the altos, is our guideline. (Most likely, it is purely accidental that Sax uses the golden section proportion in this alto, as the other instruments show quite different proportions.) In the ideal case the first, the second and the third conicity respectively would take 19%, 31% and 50% of the instrument length. Just as in the graphs of the profiles in the preparatory phase, conicities of the neck are in orange; those of the left hand are in purple and those of the right hand are in green.
Conicity is again expressed as a ratio: the number of millimeters length needed for a millimeter gain in width. From bottom up:

  1. The first one is a design on the basis of the body of an average modern alto without any further adaptations.
  2. The second one is a design which copies the Sax 24495 but now lengthened to a low A.
  3. The third one is a variant on the second in which the conicity is taken slightly narrower. The third conicity reaches right into the bell, as in Sax's straight instruments.
  4. The fourth is a variant on the third in which the twists between conicities were placed slightly higher up in the instrument and in which the bell (with a wider conicity) claims a greater part of the instrument length, as in Sax's curved instruments.
design
1 2 3 4
1st conicity (neck) 14,7 13,8 14,3 13,9
relative length (%) 18 18 18 16
truncated length (cm) 16½ 17 17¼ 16
truncated volume (cc)
entrance neck (diameter mm.) 11 12 11¾ 11¾
2nd conicity 18,0 16,8 17,25 17,25
relative length (%) 40½ 29 30 25½
truncated length (mm) 240 240 240 240
truncated volume (cc) 10,6 13,2 12,3 12,3
3rd conicity 21,7 24,4 23,5 25,6
relative length (%) 32 34 42- 42
bell, relative length (%) 10½ 10 10+ 16½
acoustistical length (mm) 1322 1322 1322 1322

sheet with bore profiles. toon profielen