Skip to content
History of Science Museum

Extinction Optical Exposure Meter

Inventory Number 84502


Acknowledgement: © History of Science Museum, University of Oxford, inv.84502

Item type
Object
Physical material
metal
Paper
Dimensions
Diameter: 67mm Height: 11mm Weight: 57g
Inventory No
84502

Description

Photometer, manufactured by Decoudun. Meter is constructed of a circular metal plate inscribed with the manufacturer's name. A rotating dial is located in the centre of the plate. On the reverse is a key for explaining the lengths of time needed for exposure in certain light levels.