4. Geometrical instruments
  5. Straight-line light ray type
  6. Celestial
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Method and apparatus for determining the position of stars

Geometrical instruments – Straight-line light ray type – Celestial
Patent

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Method and apparatus for precise calibration of magnetic compass

Geometrical instruments – Straight-line light ray type – Celestial
Patent

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Method and apparatus for sight reduction

Geometrical instruments – Straight-line light ray type – Celestial
Patent

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Method of and apparatus for telling time at night

Geometrical instruments – Straight-line light ray type – Celestial
Patent

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Modern sundial

Geometrical instruments – Straight-line light ray type – Celestial
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Multipotent astrolabe

Geometrical instruments – Straight-line light ray type – Celestial
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