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עמוד:20

Closer Reading Answer in your notebook . 1 How were most books made before the invention of the printing press ? 2 Find one invention that was not successful at first and explain why it probably did not succeed immediately . 3 The following sentences explain what has to happen before an invention can become available to the public : ? There has to be suitable technology . ? There has to be a demand for the product . ? The product must not be too expensive . ? The product has to be manufactured in large quantities . Choose one of the inventions you read about and explain how it meets all four conditions . Example : The f ax wae Invented In 1 & 43 but did not succeed f or a long time . Althoug h the technology already exieted in 19€ >& , it wae only in the 19305 that f ax machines became ular . p op Thinking About What You Have Read 1 It is often said that "necessity is the mother of invention . " Choose one of the inventions on pages 18 and 19 and discuss what need led to the invention . In what way do you think the invention influenced history ? § In your opinion , which of the inventions that you read about might still be improved in the future ? Explain your answer . ( ord Families Use the noun form of the highlighted verb 10 complete the sentence . Answer on ^ Tim ? mJ / 'fJ 4 6 . Use a dictionary to hel p you . a The radio was invented in the early 1900 s . This changed how people got the news . % When you send a fax , you connect to the telephone line . This sends the image in a digital code . ^ j Computer designers are always looking to improve the speed of computers . These make computers faster and easier to use . < 3 In the 18 and 19 centuries , many small companies produced tooth creams and powders . It was only in 1873 that the Colgate Company started mass oftoothpaste . More practice on Student Work Pages 6-7 .

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