| Answer | Crossword Clue |
|---|---|
| registered | (of an instrument) Detect and show (a reading) automatically |
| registering | (of an instrument) Detect and show (a reading) automatically |
| bombsight | (in an aircraft) an instrument for aiming bombs at a target, esp. a device that can assume complete control of the aircraft during a bombing run, can automatically compensate for speed, winds, etc., and can guide the release of bombs for maximum accuracy |
| photomultiplier | An instrument containing a photoelectric cell and a series of electrodes, used to detect and amplify the light from very faint sources |
