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Astrophotography > photorick  > Astronomy > Large Observatories > Palomar 200 inch Telescope
The 200” Hale telescope is the forth in a series of large telescopes that George Hale envisioned and was the driving force that made those projects successful. He built the largest telescope in the world four times in a row! At the start of this project in 1938 there were several major inventions required to even make a telescope of this size possible. There are several books that chronicle the fascinating story of the construction of this telescope that are worth reading. This is a selection of photos from two visits to Palomar in the early 90’s. On the second visit I was privileged to spend three nights with astronomers as they worked on two projects related to proper motion of stars and a quasar hunt.
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01,  Mt Palomar is located north east of San Diego at the end of S6 highway.
02,  Just inside the gate is a nice visitors' center with lots of information and photos related to the work at this observatory.
03,  As you can see there are many photos on the wall to see, but what starts to give you a hint of the size the main  instrument is the large granite disk in the middle of the room.  That disk is the same size as the 200” mirror and has the same curve ground into the top.  The Yerkes 40” refracting telescope (built by Hale) was the largest telescope in the world in 1898.  It’s ironic that the hole in the middle of this mirror is 40” in diameter!
04, The Monastery:  That is the name for the dormitory that visiting astronomers use while working at the site.  This is the traditional name for astronomer sleeping quarters that stared at Mt Wilson.  It housed only men and the conditions were a bit austere.
05,  When you first arrive you are directed to a whiteboard in the dining area with a floor plan of the building.  You pick a room, sign your name on the board and take the keys of the hook.  The keys provide access to the Monastery and all the observatories on the site.  The main meal of the day is served here in the evening before observations start.  It was fascinating listen to the conversations of the astronomers as they talked about their work.  It was like you would discuss issues of the day with fellow workers but in this case it was post-grad astronomy.
06,  Accommodations are simple but very adequate.  All the windows had dark shades so you could sleep in the daytime with a dark room.
07,  The telescope is housed in a 137 foot diameter dome made of 3/8” thick welded steel.  There is a second wall 4 feet inside the outer surface that provides space for insulation and ventilation.  When the shutters are open there is a 33 foot wide slot for the telescope to look through.
08,  A very tall “garage door” is seen on the left of the build.  All the parts for hardware inside the building must fit through this door.  There are large hatches in the observing floor that allow the crane on the dome to raise items from ground level up to the telescope.  The pattern of holes in the side of the building are vents for keeping the structure cool during the day.
09,  The “surrogate” mirror is stored outside across the parking area by the garage door.  Since concrete and glass are about the same density they used this concrete model of the mirror to test the telescope mounting while they were waiting for the actual 29,000 pound mirror to be completed and delivered.
01, Mt Palomar is located north east of San Diego at the end of S6 highway.
01,  Mt Palomar is located north east of San Diego at the end of S6 highway.
01, Mt Palomar is located north east of San Diego at the end of S6 highway.
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Keywords: palomar 0001
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