Works of: Gustav Heyde

Works of: Gustav Heyde
1 to 3 of 3
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Image Not Available
Exposure Measurement
Gustav Heyde
Aktino Photometer
Image Not Available
Exposure Measurement
Gustav Heyde
Aktino-photometer extinction meter
Image Not Available
Exposure Measurement
Gustav Heyde
Heyde's Aktino Photometer, model V
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