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was that a "units" issue?
Edit: OK, a bit of research. No, it wasn't units.
"The Allen Commission found that the null corrector used by Perkin-Elmer had been incorrectly assembled. Its field lens had then been wrongly spaced by 1.3 mm. The spacing of the field lens in the corrector was to have been done by laser measurements off the end of an invar bar. Instead of illuminating the end of the bar, however, the laser in fact was reflected from a worn spot on a black-anodized metal cap placed over the end of the bar to isolate its center (visible through a hole in the cap). The technician who performed the test noted an unexpected gap between the field lens and its supporting structure in the corrector and filled it in with an ordinary metal washer."
Last edited by erick; 20-09-2007 at 09:30 PM.
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