| Answer | Crossword Clue |
|---|---|
| oscillographs | OSCILLOGRAPH, an instrument for recording alternating current wave forms |
| oscillograph | an instrument for recording alternating current wave forms |
| ondograph | an instrument for producing a graphical recording of an alternating current |
| ondographs | ONDOGRAPH, an instrument for producing a graphical recording of an alternating current |
| microphone | an instrument whereby sound waves are caused to generate or modulate an electric current usually for the purpose of transmitting or recording sound (as speech or music) |
| microphones | MICROPHONE, an instrument whereby sound waves are caused to generate or modulate an electric current usually for the purpose of transmitting or recording sound (as speech or music) |
