History 05 Lesson 20

Portland cement-

Who invented it? Joseph Aspdin. When was it invented? 1824. Where was Portland cement invented? Britain. How does Portland cement work? Portland cement is the basic ingredient of concrete. Concrete is formed when portland cement creates a paste with water that binds with sand and rock to harden. These ingredients, when heated at high temperatures form a rock-like substance that is ground into the fine powder. Why is Portland cement important? It is important Because if people still had brick roads it would be very bumpy and it would wear out very fast.

Electromagnets-

Who invented it? William Sturgeon. When was it invented? 1824. Where were electromagnets invented? Britain. How does it work? Electromagnets. Electromagnets are different from permanent magnets. Electromagnets are made of coils of wire with electricity passing through them. Moving charges create magnetic fields, so when the coils of wire in an electromagnet have an electric current passing through them, the coils behave like a magnet. Why is it important?
Electromagnetism has important scientific and technological applications. It is used in many electrical appliances to generate desired magnetic fields. It is even used in an electric generator to produce magnetic fields for electromagnetic induction to occur.

Passenger Rail-

Who invented it? Richard Trevithick. When was it invented? 1825. Where was it invented? Great Britain. How does it work? A passenger train includes passenger-carrying vehicles and can often be very long and fast. … Passenger trains travel between stations or depots, where passengers may board and disembark. In most cases, passenger trains operate on a fixed schedule and have superior track occupancy rights over freight trains. Why is it important? So that people can get to work faster.

Matches-

Who invented it? John Walker. When was it invented? 1826. Where was it invented? Stockton-on-Tees, County Durham. How do they work? If the match is struck against the striking surface, the friction causes the match to heat up. A small amount of the red phosphorus on the friction surface is converted into white phosphorus. The heat ignites the phosphorus that has reached the match head of the match when rubbing. Why is it important? Friction matches gave people the unprecedented ability to light fires quickly and efficiently, changing domestic arrangements and reducing the hours spent trying to light fires using more primitive means.

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