Taps and Faucets     Water is a necessity of life and we cannot do without it, however the supply of purified water for human consumption or use is not unlimited thus we need to regulate it. This regulation is carried out with the help of a device called a Tap or Faucet. This device is fixed on to a water pipes and is made of a handle or knob at...

The Light Bulb Life would not be possible on the Earth without light. In the daytime the Sun provides us with it and after sunset, the light comes out of a device commonly known as the light bulb. The light bulb is made of a metal base which houses a glass support through which pass two pieces of metal wire, these are joined together at the top with a tiny spiral...

Rockets It is the age of the rockets today and it all began way back in China about 800 years ago, the Chinese used them initially as fireworks and then for war. Rockets first came to Europe and India in the middle of the thirteenth century. They were primarily used for war as a replacement for burning arrows, or for signalling. In the beginning of the nineteenth century a contingent of...

Petroleum   Oil is pumped out of holes drilled in the ground, both on land and in the seas, and the unpurified oil is called Petroleum. With the advent of the industrial revolution in Europe, there arose a need for a better fuel to run engines and light the lamps. In America a man called George Bissell first thought of drilling oil from the ground. He extracted and sent a sample...

Electricity “Life without electricity! impossible.” yes it is true. Today most things are not possible without electricity, for that matter this book could not have been printed without it either. We owe it to Alessandro Volta who, in the year 1800, invented the first battery which made possible the providing of a continuous electrical current. In those days there were various machines which provided electricity in surges but not a continuous...

The Postal System Today we put a letter into as letter box and take it for granted that our letter would reach the person we have addressed it to, it would be worthwhile to understand how the postal system started. The postal system dates back to the times of the Romans and the Persians, but in those days the government took responsibility only of its own official messages. Later in the...

Submarines and Ships The development of ships began with reed boats and rafts more than 6000 years ago. The first boats were used by the Egyptians and they were made of a wicker frame covered with the skins and hides of animals, these were small crafts and could he used by one or two persons. Subsequent to this they invented the sails in the year 3200 B.C. and larger boats made...

Aeroplane Man always had a fascination to be able to do the things he was not physically capable of doing and some how or the other he always found a way of doing it. Though never meant to but man had always wanted to fly. Lot of attempts were made unsuccessfully till the year 1890 when a German engineer called Otto Lilienthal developed, what we know today as, a hang glider...