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A New or Improved Means or Apparatus for Testing Telescopes, Opera and Field Glasses, and the like.
A New or Improved Means or Apparatus for Testing Telescopes, Opera and Field Glasses, and the like.
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机译:用于测试望远镜,戏曲眼镜和野外眼镜等的新的或改进的装置或设备。
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11,588. Aitchison, J., and Drysdale, C. V. May 21. Telescopes and opera-glasses.-Relates to apparatus for determining the magnifying power and the angular field of view of telescopes and the like. The instrument to be tested is placed upon a table h, and directed towards a collimator a with an illuminated scale c, an image of which is projected upon a screen g by the auxiliary lens f. The scale c may be replaced by a single slit between which and the lens b, a Maddox or bi-prism may be placed.
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