| Answer | Crossword Clue |
|---|---|
| ONDOGRAM | Record of wave forms of electric current. |
| ondogram | a graph of electric wave forms |
| ondograms | ONDOGRAM, a graph of electric wave forms |
| oscillograph | an instrument for recording alternating current wave forms |
| oscillographs | OSCILLOGRAPH, an instrument for recording alternating current wave forms |
| cycle | A recurring series of successive operations or states, as in the working of an internal combustion engine, or in the alternation of an electric current or a wave |
