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| Hot-air balloon | Which gas does it use?
Propane gas What is the envelope made of? Panels of lightweight fabric |
Joseph and Jacques Montgolfier | 1783 | Floating |
| Electric guitar | What are its different parts?
Tuning pegs, metal strings, pickups, volume and tone controls What are the tuning pegs for? Prevent strings from slipping and tune the instrument |
Adolphus Rickenbacker | 1932 | Sound |
| Microwave oven | What is the timer for?
Set the time for cooking What are microwaves? Electromagnetic radiation |
Percy le Baron Spencer | 1945 | Heat |
| Personal Computer | Name two peripherals
Printers, disk drives What is the modem for? Connect the computer to a telephone line |
Edward Roberts | 1975 | Computer |
| Telephone | Which parts does a telephone have?
Earpiece, key pad, ringer, flash hook, mouth piece and cable Where is the loudspeaker? In the earpiece |
Alexander Bell | 1876 | Telecommunications |
| Your machine |
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