Across
- 4. the man Bluetooth was originally named after
- 5. invented the telephone in 1876
- 8. what sound requires in order to travel
Down
- 1. a device that is able to convert sound into electrical pulses
- 2. a cartoonist, author, and sculptor who created drawings of machines accomplishing simple tasks
- 3. in the same energy family as light energy
- 6. IMPROVED the telephone in 1877
- 7. does not increase how far sound travels