Across
- 5. - Early audio recording medium.
- 6. - Early sound-reproducing device.
- 7. - Zeppelin-style dirigible.
- 11. - Industrial revolution power source.
- 13. - Early motion picture viewer.
- 15. - Optical precursor to the camera.
Down
- 1. - Sound amplification device.
- 2. - Early pedal-powered vehicle.
- 3. - Automated money handler.
- 4. - Morse code sender.
- 8. - Human-powered two-wheeler.
- 9. - Automated fabric stitching device.
- 10. - Thomas Edison's groundbreaking sound player.
- 12. - Mechanical writing apparatus.
- 14. - Samuel Morse's long-distance communicator.