| 摘要 |
A porous wall (62) through which a flow of gas is established forming a layer (18) supporting a liquid mass (17) is strengthened (63, 64) partly to stiffen it and partly to control the shape of the lower surface of the supported liquid (17). Chambers containing different pressures (67, 68) can be formed and, possibly, separated by some (63) of these strengthening parts to improve the equalisation by reducing the pressure at the centre; finally, capillaries (70) may pass through the plate (62) to measure the pressure or provide additional equalisation of the thickness of the layer by means of a suction device.
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