Ships and Ocean Liners   There are various types of ships which include ‘Cargo Carriers’ for carrying various types of cargo in the holds or on the deck in containers, .Oil Tankers’ for carrying oil, ‘Naval Battleships’ for defence and ‘Aircraft Carriers’ which carry aeroplanes for the Navy. There are also the ‘Ocean Liners’ which are large ships used for transporting people at sea. Ships of all types may be built...

Electric Locomotives The first Electric locomotives were run on batteries but modern day electric locomotives draw their power from over head wires or a third rail which runs parallel to the tracks. Electric locomotives have an arm on the top called the ‘pantograph’, when raised, this arm touches a high voltage un-insulated wire which runs overhead. The power drawn from this wire powers the electric motors in the engine thus allowing...

Steam Locomotives The first steam locomotive was built by George Stephenson in the year 1825 and was called ‘Locomotion’. The steam locomotive simply defined is a large water boiler on wheels. The front of the engine comprises of a boiler which houses a large number of metal tubes, in the middle is the driver’s cab and in the rear is a separate cab in which coal is carried. Water is filled...

Automobiles Technology The first cars were developed in the 18th century with steam engines. Modern day cars have internal combustion engines which comprise of a number of air tight chambers in which a series of flat topped pistons are located. The lower end of these pistons is connected to a shaft which allows them to move up or down within the cylinder. A mixture of petrol and air is sprayed into...

Motorcycles The first motorcycle was built in the year ‘1885 by a German called Gottlieb Daimler. It was a very crude version of the modern day motorcycle, it was only a wooden bicycle frame fitted with a small petrol engine. Today motorcycles in contrast are complicated machines. They have engines which are similar to a car but smaller in size and are generally two stroke or four stroke internal combustion air...

Lifts High  rise floors we use a simple principle as buildings are increasing each day and to get to the upper lifts. As much as they are convenient to use, they work on well. It. is difficult to lift a heavy object till you can appropriately counter the force of gravity. The car of the lift is pulled upwards or lowered with the help of a steel cable. On the other...

Computers   Computers are capable of doing small things like playing games to bigger ones like guiding a spacecraft in outer space. Simply put, the computer is like a storage cabinet which is capable of storing data in an organised manner, besides this it is also capable of accessing the data very quickly and also analysing it based upon our requirements. The description may seem fascinating but a computer is not...

Telephone The invention which transformed the world of communication, the Telephone, was invented by Alexander Graham Bell. Its frequent use has today made it an inseparable part of our lives and we hardly stop to think how it may work. Telephones are made in various shapes and sizes but some of the essential features include a circular or push button dialling pad and a hand piece alongwith a base unit, in...