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Book 3: Chapter 20 – Wonder Machine
1.

1. The lift is also called an elevator. In 1000, the Book of Secrets by al-Muradi  in Islamic Spain described the use of an elevator-like lifting device, in order to raise a large battering ram to destroy a fortress.

 2. windmill which isused for generating electricity is commonly known as wind turbine. The wind wheel of the Greek engineer Heron of Alexandriain the 1st century AD is the earliest known instance of using a wind-driven wheel to power a machine.

3.photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. The first widely used copy machine for offices was invented by James Watt in    1779.

4. Solar panels use light energy (photons) from the sun to generate electricity. A solar panel is a packaged, connected assembly of solar cells, also known as photovoltaic cells. 

5. Escalators are used around the world to move pedestrian traffic in places where elevators or lift would be impractical.

6. Radar is used to detect aircraft, ships, spacecraft, guided missilesmotor vehiclesweather formations, and terrain. Radar was developed in secret in nations across the world during World War II.

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