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Double Astrograph  Arnold Klemola & Burt Jones at the
AstrographThe 20-inch Double Astrograph is a unique wide-angle
photographic camera, specially designed for the historic Lick
Northern Proper Motion survey, a mammoth photographic survey of
the northern sky carried out over half a century by four
generations of Lick astronomers. The Astrograph was designed and
built during the Great Depression, with funds granted by the
Carnegie Corporation in 1934. It was installed, at first with
the "blue" lens only (see below) at Mount Hamilton in 1941, and
completed with the addition of the "yellow" lens in 1962, funded
by the National Science Foundation. Click on graphics for
enlarged views of the Astrograph.  A double astrograph is the
optimal telescope to survey large areas of the sky accurately
and efficiently. The two 20-inch refractors are mounted side-by-
side, like a pair of binoculars. Each tele