4. Geometrical instruments
  5. Straight-line light ray type
  6. Vertical angle

Gerd Finnern

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Apparatus for fine adjustment of a sextant

Geometrical instruments – Straight-line light ray type – Vertical angle
Patent

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Drum screw with measuring drum for a sextant

Geometrical instruments – Straight-line light ray type – Vertical angle
Patent

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Optical angle measuring instrument

Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent

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Sextant

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric
Patent

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Sextant with adjustable handle

Geometrical instruments – Straight-line light ray type – Vertical angle
Patent

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Profile ID: LFUS-PAI-P-249464

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