dynactinometer

English

Etymology

From Ancient Greek δύναμις (dúnamis, “force”) + actino- +‎ -meter.

Noun

dynactinometer (plural dynactinometers)

1. (historical, photography) An instrument for measuring the intensity of photogenic rays and computing the power of objectives. It was invented in the 19th century by Antoine François Jean Claudet

See also

• lensometer
• photographometer

References

• “dynactinometer”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.