Across
- 2. After many experiments, they finally came up with a ________ called telephone.
- 6. Bell demonstrated his invention at __________ exhibitions.
- 7. verb of transmission
- 8. Bell____ first to Canada and then to the USA.
- 9. noun of invent
- 10. The telephone was first ___________ in 1876.
Down
- 1. The first telephone was in ____ use in 1877.
- 3. Bell and Watson conducted many __________.
- 4. People can neither speak nor hear.
- 5. verb of assistant