4. Optics: measuring and testing
  5. Photometers
  6. Integrating

Darwin E. Chapman

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Adjustable current lamphouse

Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent

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Darkroom exposure meter and densitometer

Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent

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Digital exposure meter

Optics: measuring and testing – Photometers – Integrating
Patent

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Digital exposure meter

Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent

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Motorized base for use in developing photographic prints

Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent

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