This is the Watkins Bee Exposure Meter, patented in 1890. This is a pocket-watch sized version of the original light meter produced by Alfred Watkins. It uses round disks of light-sensitive paper and required counting how long it took said… Read More ›
This is the General Electric (GE) DW-68 selenium cell exposure meter circa 1950. It is essentially a 2D incident meter with a hood. This particular meter still works and is (mostly) accurate.