It's the only open pipe stop.
All pipes are conicals. They have a wooden harmonic bridge, for the basses and a metal harmonic bridge for the trebles.
The basses (12 first pipes) are made in zinc, the other in plain metal

 

Diameters of the windchest holes

Note
Hole (mm)
 Note
Hole (mm)
 Note
Hole (mm)
do 1
13
 do 3
8
 do 5
6
do# 1
13
 do# 3
8
 do# 5
6
ré 1
13
 ré 3
8
 ré 5
6
ré# 1
13
 ré# 3
8
 ré# 5
6
mi 1
12
 mi 3
8
 mi 5
6
fa 1
12
 fa 3
8
 fa 5
6
fa# 1
12
 fa# 3
8
 fa# 5
6
sol 1
12
 sol 3
8
 sol 5
6
sol# 1
12
 sol# 3
8
la 1
12
 la 3
8
la# 1
12
 la# 3
8
si 1
12
 si 3
8
do 2
11
 do 4
7
do# 2
11
 do# 4
7
ré 2
11
 ré 4
7
ré# 2
10
 ré# 4
7
mi 2
10
 mi 4
7
fa 2
10
 fa 4
7
fa# 2
9
 fa# 4
7
sol 2
9
 sol 4
7
sol# 2
9
 sol# 4
7
la 2
9
 la 4
7
la# 2
9
 la# 4
7
si 2
9
 si 4
7

 

 

The biggest pipe of the organ (Gambe 8' - C1) with the the smallest pipe (Larigot 1 1/3 - G5)

 

 

The pipes are mounted on the windchest from F2
The basses are mounted on a groove-block, behind the organ and an other little groove-block on the left side of the windchest.

 

The 12 first pipes mounted on the groove-block

 

The 12 basses sont repainted (on the pictures : before and after)

 

The wooden harmonic bridge



The 12 first pipes mounted on the groove-block behin the organ

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