Synonyms:
capacitor, capacitance, condenser, electrical_condenser
Meaning: an electrical device characterized by its capacity to store an electric charge
Usage examples
As to the additional reference letters, I is a condenser J the source of light, and K a reflector.
The positive film is moved intermittently but swiftly throughout its length between the objective lens and a beam of light coming through the condenser, being exposed by the shutter during the periods of rest.