Up Anssi's Collection | Light meters | Imperial Duplex

ImperialDuplex-01
ImperialDuplex-09
ImperialDuplex-03
ImperialDuplex-04
ImperialDuplex-06
ImperialDuplex-05
ImperialDuplex-07
ImperialDuplex-08
ImperialDuplex-02
ImperialMeter_BJP1910

Imperial started making these simple actinometers in the beginning of the 20th century. This one is from 30's, and is a Duplex model that has two meters bound together: one for bright light, and another for "dull light and interiors".

This one is in pretty good condition, bought from Maidenhead, UK

JAlbumChameleon