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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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19,  This shows the access way into the west yoke arm, which contains the drive mechanism for the declination axis, (north/south motion).
20, This is a Russell drawing showing the declination drive mechanism in the west yoke arm.  The 14 ½ foot diameter drive gear is seen in the upper right of the drawing.
21,  The cover on the Declination Computer was pulled back for this photo.  This is an analog mechanical computer used to compensate position for atmospheric refraction, mechanical flexure and other variables.  Today this is all done with software.  The large motor in the upper left is used for slewing the telescope in the north south direction.
22,  Russell’s drawing of the east yoke arm shows the alternate Cassegrain focus.  With two additional mirrors the image beam is sent into the east arm and down along an optical bench where larger items can be mounted than can fit into the observer’s cage behind the main mirror.  This path is rarely used.
23,  Looking through the entrance port in the east yoke arm you can see the curved stairs use to access the Cassegrain focus.  These stairs are curved so you can enter this arm with the telescope in any position.  The straight stairs behind the technician always rotate to stay on the “bottom” as the telescope moves.
24,  This shows the upper part of the optical bench, which can also rotate depending on the position of the telescope.  The light reaching this focus passes through the hole in the center of the arm, which is about 6 inches in diameter.
25,  On the left side is the glassed in visitors' gallery.  At the end of the visitor’s gallery is the operator’s room.  You can see a rectangular window with a shad partially pulled down (by stairway) that allows the operator to see the telescope directly.  The Hartmann screen for optical testing is in the lower right of the photo.
26,  In this west view of the telescope you can also see part of the vacuum chamber (left) used to aluminize the mirror.
27,  This shows the f/16 Cassegrain focus behind the main mirror.  The 29,000 pound mirror is just above the frame work in this photo.  The “4 Shooter” CCD camera designed by Jim Gunn is mounted at this focus and is being prepared to search for quasars.  This camera uses four CCD arrays in a mosaic to record a larger image than a single array.  You can guess how the camera got its name.
19, This shows the access way into the west yoke arm, which contains the drive mechanism for the declination axis, (north/south motion).
19,  This shows the access way into the west yoke arm, which contains the drive mechanism for the declination axis, (north/south motion).
19, This shows the access way into the west yoke arm, which contains the drive mechanism for the declination axis, (north/south motion).
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Keywords: palomar 0019
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