Review of reviews and world's work . s when study their spectra. Fortunately it i- quite the moon entirely covered the disk of the sun. possible to construct reflecting teles huh li the horizontal teles•. hi) h I perieni e v. ith the horizontalinstrument showed mightprove advantageous. Forthe first of these a tower of 1 65 feet in height v( onstnu ted, with a platformon top where the ccelostal mOUl • that the beam of light v >~ re Y> ted vertit ally downward through 9 lens at or mar the plat m, , ,x , ,(H)I SPECTROHELIOCRAPH OF IHI SNOW TELE5< 1 .. - rj 1 ? Lu DI \C1 \\l SHOW :WON OF
Review of reviews and world's work . s when study their spectra. Fortunately it i- quite the moon entirely covered the disk of the sun. possible to construct reflecting teles huh li the horizontal teles•. hi) h I perieni e v. ith the horizontalinstrument showed mightprove advantageous. Forthe first of these a tower of 1 65 feet in height v( onstnu ted, with a platformon top where the ccelostal mOUl • that the beam of light v >~ re Y> ted vertit ally downward through 9 lens at or mar the plat m, , ,x , ,(H)I SPECTROHELIOCRAPH OF IHI SNOW TELE5< 1 .. - rj 1 ? Lu DI \C1 \\l SHOW :WON OF TIIK I -. ICAL I 1 i 1 With 1 • in tant ten;ture chamber in rock formirrors and gratir j «fcr M fe_ * ** . r, ^fei^^^ mi THE SOLAR OBSERVATORY OX MOUNT WILSON 199. glass 60 inches in diameter, 8inches in thickness, and weigh-ing one ton, was secured fromthe French Plate Glass Worksat St. Gobain, and the task ofgrinding and polishing wastinallv completed at the largeinstrument and optical shop ofthe Solar Observatory in a disk of glass is of courseonly a foundation for the actualreflecting surface, which is afilm of polished silver depositedon it. The construction of theheavier parts of the mountingfor this great mirror was under-taken by the Union Iron Worksof San Francisco, the buildersof battleships for the UnitedStates Government, afterdesigns prepared by ProfessorRitchey, but all of the smallerand more delicate parts werebuilt in the observatory instru-ment shop. This 60-inch reflec-tor is housed in a dome ofspecial design with a massiveare mudi better adapted for this purpose than foundation for the telescope and an under-even the most jxnverful refractors. ground chamber for spectroscopic work. Improvements in the construction of
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