Abstract
Photoelectric techniques have previously been employed in the study of yarns and fabrics1,2. In the work here described. a photoelectric device was used to examine nylon parachute fabrics for variations of open area. Both dyed and undyed fabrics were tested so that allowance could be made for filament translucency. By selecting fabrics of varying porosity, the dependence of air flow on open area was investigated, particularly in respect of variations across the width of the fabric. The conclusions reached were confirmed by means of the bubble-pressure3 method.
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