4. Radiant energy
  5. Photocells; circuits and apparatus
  6. Optical or pre-photocell system

Frank Fruengel

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Arrangement for in situ determination of quantity of turbid matt

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Device for measuring cloud height

Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent

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Method of and a device for adjusting a high-speed photographic a

Optics: motion pictures – Time compression or expansion
Patent

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Profile ID: LFUS-PAI-P-1362989

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