NAVIGATION
Gallium arsenide Optical Window, 25.4mm (1.0in) dia x 2mm (0.08in) thick
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Ruby sphere; diameter(mm), 1.19 (3/64 in); grade 25
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Ruby sphere; diameter(mm), 1.59 (1/16in); grade 25
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Ruby sphere; diameter(mm), 3.18 (1/8in); grade 25
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Ruby sphere; diameter(mm), 4.76 (3/16in); grade 25
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Ruby sphere; diameter(mm), 0.25; grade 25
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