The aperture wheel assembly consists of a housing, a drive motor with reduction gearing, a mechanical geneva mechanism for indexing the wheel, and an aperture wheel. Only the wheel is shown in cross section in Figure 2-4. The aperture wheel is made of titanium and has a thin disk of nickel-plated copper mounted to its upper surface. There are eight positions, seven of which contain accurately etched holes to admit light into the spectrometer and one of which has no hole to provide a vacuum seal. The aperture positions and sizes for the Astro-2 configuration of HUT are given in Table 2-1.
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