![]() ![]() Apparently, the 8.4-meter maximum size is dictated by the width of US highway underpasses. Our tour guide also showed us the equipment the lab uses to optically test the mirrors and the equipment and area they use to pack each mirror up for shipment. The other mirror we saw was being polished on a huge rotating platform. One mirror was "baking" in a huge rotating oven, which is spun in order for the glass to reach the appropriate parabolic shape as the once-molten glass slowly cools. That telescope will use a total of seven 8.4-meter mirrors, which is the largest that the mirror lab can make. We lucked out and they were working at the time on mirrors for the Giant Magellan Telescope. Then it moves to the telescope-making facility proper, where you can, if you are lucky, view mirrors in a number of different stages of completion. The tour starts out in a lecture room where you get a slide presentation. This tour should be fascinating for anyone even remotely interested in how the largest mirrors in the world for some of the largest telescopes in the world are made. If they had been allowed to join, the tour group would have almost doubled in size. The necessity of that was driven home when we saw a number of people being denied entry to our tour because they didn't already have valid tickets (they actually had tickets for the same time slot on a different day). We had, of course, purchased tickets several weeks prior. Retrieved Octo– via wife and I visited this one-of-a-kind facility one afternoon in early November last year during a two-night, two-day stay in Tucson. ^ " 'Magic Tunnel' or 'Crooked Road'? Underpass Debate Revs Up in Douglas". ![]() Charleston, South Carolina: Arcadia Publishing. United States Gross Domestic Product deflator figures follow the Measuring Worth series.
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