| Answer | Crossword Clue |
|---|---|
| keraunographs | KERAUNOGRAPH, an instrument for detecting distant thunderstorms also CERAUNOGRAPH |
| keraunograph | an instrument for detecting distant thunderstorms also CERAUNOGRAPH |
| reflectometers | An instrument for measuring quantities associated with reflection, in particular (also time domain reflectometer) an instrument for locating discontinuities (e.g., faults in electric cables) by detecting and measuring reflected pulses of energy |
| reflectometer | An instrument for measuring quantities associated with reflection, in particular (also time domain reflectometer) an instrument for locating discontinuities (e.g., faults in electric cables) by detecting and measuring reflected pulses of energy |
