Abstract
AbstractThe usual Nipkow scanning-disk has the scanning-points arranged in a spiral at equal angular and radial intervals. This arrangement of points will scan a field that is a sector of an annulus concentric with the disk. This field must usually lie within a circular field whose parts outside the sector are wasted. We give a method of arranging scanning-points on a disk so that they can scan a complete circular field. We tabulate the key results for fifty-three cases and present graphs from which other cases can easily be computed. About 45 per cent more information can be collected with the circular than with the sectorial scan.
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