Children's Encyclopedia1976 |
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Pàgina 14
... invented the windmill . As long ago as the 12th century people were using them to grind corn . The picture shows an old - fashioned Dutch windmill and a modern American windmill . BRISTOW B Muscle Power — When we run , our muscle power ...
... invented the windmill . As long ago as the 12th century people were using them to grind corn . The picture shows an old - fashioned Dutch windmill and a modern American windmill . BRISTOW B Muscle Power — When we run , our muscle power ...
Pàgina 55
... invented . Railways were used less and less and some lines closed . Now , new trains are being built which travel twice as fast as a car . And hover - trains which glide on a cushion of air have been invented . The railways of the ...
... invented . Railways were used less and less and some lines closed . Now , new trains are being built which travel twice as fast as a car . And hover - trains which glide on a cushion of air have been invented . The railways of the ...
Pàgina 60
... invented . Who can guess what difference today's inventions will bring ? In the future , spacecraft and satellites of all kinds will be launched in space from big orbiter craft . The picture above shows the orbiter launching a satellite ...
... invented . Who can guess what difference today's inventions will bring ? In the future , spacecraft and satellites of all kinds will be launched in space from big orbiter craft . The picture above shows the orbiter launching a satellite ...
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