Capstaff-Purdy pattern; visual matching of brightness of ccentral spot, lit by electric lamp through disc continuous wedge and specimen. With directly lit peripheral field.
Details
- Category:
- Photographic Technology
- Collection:
- Kodak Collection
- Object Number:
- 1990-5036/7900
- Measurements:
-
overall: 631 mm x 522 mm x 245 mm,
- type:
- densitometer
- credit:
- The Kodak Collection at the National Media Museum, Bradford
