Across
- 5. Long-distance messaging.
- 7. Five-electrode tube.
- 9. Explores tiny worlds.
- 11. Measures electrical current.
- 12. Amplifies your voice.
- 14. Unravels secret messages.
- 15. Stir with electric energy.
Down
- 1. Instant photo innovation.
- 2. Early photo printing.
- 3. Measure pace swiftly.
- 4. Gauges electrical resistance.
- 6. Projects images brightly.
- 8. Early vacuum tube.
- 10. Early sound player.
- 13. Powered by compressed air.