Each groove has a bearing wall (350) and a wedging wall (370) shaped.

The top wall (11) is at least connected to one of the left wall (13), right wall (14), and back wall (15) via an oblique wall (16, 17).

The oblique sidewall can allow more uniform phosphor coatings than conventional orthogonal sidewalls.

At least one plane oblique wall surface (6) is formed between the vertical wall (3) and a cover (2) of the inner container (1), the evaporator (5) extending on said surface.

The external oblique retaining wall (called skarpas), was built after the reconstruction.

The operative region of the chamber (4) is thus gas-permeable on the inflow side, while the oblique wall (10) induces an obliquely downward gas flow in this region.

The tubes are open at both ends.

A plurality of tubes that extend vertically in relation to the direction of flow of the waste water is located on the skinplate.

An effusion cooled transition duct (40) with angled film cooling holes in the axial and optionally transverse directions is disclosed.

Each oblique wall (24) joins the bottom (25) to a sidewall (23), with ends (28) joining the sidewalls (23), bottom (25) and oblique walls (24) to form an open enclosure for the container (20).

Suppose that, by means of a series of ideal threads or lines, I reproduce on the oblique surface each point of the image drawn on my sheet of paper.

In operation, the sonic transducers (30) on each oblique wall (24) are multiplexed so that deleterious interference between sonic waves from the two oblique walls (24) is avoided.

Each groove has a bearing wall (350) and a wedging wall (370) shaped.

A third sidewall is at an oblique angle relative to the first sidewall.

The top wall (11) is at least connected to one of the left wall (13), right wall (14), and back wall (15) via an oblique wall (16, 17).