| Answer | Crossword Clue |
|---|---|
| geophone | a device that detects vibrations in the earth |
| geophones | GEOPHONE, a device that detects vibrations in the earth |
| photodetector | A device that detects or responds to incident light by using the electrical effect of individual photons |
| photodetectors | A device that detects or responds to incident light by using the electrical effect of individual photons |
| phonoscope | a device that renders visible the vibrations of sound waves |
| phonoscopes | PHONOSCOPE, a device that renders visible the vibrations of sound waves |
