#1575;لرجاء الانتظار حتى اكتمال تشغيل الصفحة
Unit 17 Important discoveries
اكتشافات هامة
3&4
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Teacher : Today, I’m going to talk about the history of flight. I’ll start by telling you how the first plane was designed. Does anyone know anything about it? |
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| Boy 1 : I think the first plane was designed by Leonardo da Vinci. | ||
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| Teacher : That’s correct. The first drawings of planes were made in the 1480s. A plane was designed by the famous Italian scientist and artist, Leonardo da Vinci. | ||
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| Boy 2 : Did they use his original drawing to build a plane? | ||
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| Teacher : No, they didn’t. But the drawing helped people to think about how they could fly. Now, much later, two French brothers, the Montgolfier brothers, invented the first hot air balloon. This is how it worked. They used a fire to blow hot air into the balloon. Passengers sat in a large basket that was tied to the balloon. The first passengers in the hot air balloon were animals! The first flight with people in a hot air balloon was completed in 1783. Many other flying machines were invented after this time. Some worked, but some didn’t! Then, after years doing experiments with planes, the first flight was made by the American Wright brothers, in 1903. I’ll tell you something interesting about this flight. It lasted only twelve seconds! Finally, let’s look at how their plane design was changed over the next years... | ||
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