Western Electric photoelectric cell No. 2A c1930. Used for the reproduction of variable density optical sound tracks Western Electric photoelectric cell
Glass cylinder, 14.5cm long and 3.5cm in diameter. Electrodes (one missing) at either end. Element flat, 10 x 1.2cm. Photoelectric Cell
Thin sheets of slate(?) coated with photoelectric medium with zigzag scratching. Dated 17/11/16 and 20/7/16. Experimental Photoelectrical Cells
Experimental ? Vacuum photocell. Sprayed interior of spherical glass with wire ring electrode with wire connections. Vacuum Photocell
2.5 x 2.5cm ceramic plate with photoelectric coating. Held by two copper strips with brass terminals mounted on an ebonite base. Photoelectric Cells
Small photocell 5 x 5mm across two brass blocks with insulating divider. Faced with insulation top and bottom. Mica protective window. No.709. Photoelectric Cells
Glass cylinder, 4.2cm long and 4.7cm in diameter. Circular element 3.2 in diameter. Type ZACV/144 U4 grade. Photoelectric Cell