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1908—1909. This was the beginning of modern Geigers (Geiger counters).
In 1895 a well-known German physicist Wilhelm Conrad Roentgen discovered X-rays which we usually call Roentgen rays. He named them in such a way because of their mysterious nature. X-rays are widely used in medicine, different branches of science and technology.
Do you know that until just over a hundred years ago there was no such an instrument as the saxophone? It was invented by a Belgian musician Adolphe Sax in 1842. The saxophone was very successful and is often played today, especially in bands, but the other new musical instruments which Sax invented were less popular and are hardly ever heard today.
4*. Answer the questions in writing.
1. What makes our life easier, longer and warmer?
2. What is Rudolf Diesel famous for?
3. What did Hans Wilhelm Geiger design in 1908—1909?
4. What was Wilhelm Roentgen?
5. Where are X-rays widely used?
6. What was invented by Adolphe Sax in 1842?
5*. Write the words (exercise 2) into your vocabularies.
Lesson 20
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6. Read your answers (exercise 4 ).
7. Read the words (exercise 2 ).
8. a) Read the words, word-combinations and sentences with the translation.
b) Cover the left side of the page and translate into Eng lish.
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an invention a new invention a few inventors well known famous inventions a transport revolution Geiger counter hardly ever
their mysterious nature just over a hundred years ago
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винахід новий винахід мало винахідників добре відомий знамениті винаходи революція в транспорті лічильник Гейгера дуже рідко
їхня таємнича природа понад сто років тому
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