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On the removal of any plug, this wire gauze prevented the sand from flowing with the water into the well; but while the finer particles of sand remained in the neighbourhood of the orifice, the flow of water through the contracted area was very small.
Observed through this the structure of some wire gauze just disappeared at a distance from the eye equal to 17 in., the gauze containing 46 meshes to the inch.
The ends of the char-kadd cover the shoulders, but the gauze pirahan is quite transparent.
The disk 32 operates the wire gauze screens for equalizing the brightness of the two stars under observation.