Achromat Reimaging

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  Planetary Achromat

  Additional Formats

  [Incl c.ltr BHRule to Gordon Wares; ltr Robert L. Milkis to ISB; c.ltr WABaum to Max Bray; ltr WABaum to ISB; memo "Preliminary Tests on New Color-Correcting Lens for 24-Inch Lowell Refractor," by WABaum]

  Bowen

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  Achromat Corrector

  Additional Formats

  [Incl note C. C. Wheeler to ISB]

  Bowen

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  Maksutov Achromatism

  Additional Formats

  Bowen

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  Parabola Reimaging

  Additional Formats

  Bowen

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  Baum Double Achromat

  Additional Formats

  Bowen

• Image not available

  Double Paraboloid Reimaging

  Additional Formats

  Bowen