Kunz photo electric cell (1925)
1925
Photo-electric cell, VNG7
Photo electric cell made at the Clarendon Laboratory
Photo-electric cell, KG1
Dummy photo-electric cell type C.M.G.8
Photo-electric cell
Photo-electric cell, new type, CMG 8
Photo-electric cell, KMV6
Photo-electric cell, KG2
Working model of Baird multiplier photo-electric cell
Weston normal cell (photo-electric)
1926