The ORP52 is a cadmium sulphide light dependent resistor.
The resistive material is deposited on the ceramic substrate. The vertical bars are connected in parallel not in series. The connections are at the top and bottom of the disc substrate.
The pinch and two mica supports for the connecting tapes.
The thin glass tube envelope is 15 mm in diameter and, excluding the base wires, is 39 mm tall.
Reference: Observation. Type ORP52 was first introduced in 1959. See also 1959 adverts.
Updated August 18, 2019.