Across
- 4. The system was invented by Philo Taylor Farnsworth, a 21-year-old inventor.
- 5. It was built in 1885 and the speed of it was 16 km per hour.
- 6. It was completed in 1946 and it weighed almost 50 000 kg.
- 7. It was invented by Alexander Graham Bell in 1876.
Down
- 1. The first one was invented in 1992.
- 2. It was invented by Alessandro Volta in 1800.
- 3. It made its first flight in 1903.
- 5. It was invented in 1816 by Frenchman Joseph Nicéphore Niépce.