| Answer | Crossword Clue |
|---|---|
| RADIOSONDE | Device for signaling weather data. |
| PAGERJUICE | Electricity for a signaling device? |
| buzzers | An electrical device, similar to a bell, that makes a buzzing noise and is used for signaling |
| buzzer | An electrical device, similar to a bell, that makes a buzzing noise and is used for signaling |
| heliographs | device for signaling by means of a movable mirror that reflects beams of light, esp. sunlight, to a distance |
| heliograph | device for signaling by means of a movable mirror that reflects beams of light, esp. sunlight, to a distance |
