Category Invensions & Discoveries

How thermometer works?

Are you hot or cold? A thermometer will take your temperature. There are many different kinds used for different purposes. Take your pick.

One type of thermometer has a thin glass tube partly filled with liquid. When the air is warm, the liquid in the tube becomes warm and rises. It rises because heat makes a liquid expand, or take up more space. The warmer it gets, the more space it needs. When the temperature drops, the liquid contracts, or takes up less space, so it moves down the tube. The liquid in many thermometers is a silver-coloured metal called mercury. Some thermometers are filled with coloured alcohol.

A digital thermometer has a metal probe. When the thermometer is turned on, a battery inside sends around an electric current. If the probe is warm, the current will move easily. If the probe is cool, the current will not move as easily. The thermometer shows a temperature reading based on how easily the current moves.

Doctors often use an IR thermometer to detect infrared rays from a person’s eardrum. The hotter you are, the more radiation the thermometer detects. The thermometer converts the amount of radiation to a temperature reading.

 Standard thermometer contains a liquid that moves up when it becomes warm. The liquid drops down when it cools. The lines indicate the temperature.

The lines and numbers on the thermometer indicate degrees. They tell you how much the temperature changed. Degrees are marked with the symbol º. The number 0 ºC is the temperature at which water freezes. This is the same temperature as 32 ºF. The letter C stands for Celsius, and the letter F stands for Fahrenheit.

 

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Who are inventors?

Inventors are men and women who make things that make our life easier.

Many inventions are simple. In 1865 in the U.S.A., S.E. Pettee invented a machine for making paper bags. And Earle Dickson invented the first ready-to-use bandage in 1920.

Some inventions take many years to develop. The great Italian artist Leonardo da Vinci made drawings of his ideas about 500 years ago. He drew an aeroplane, a parachute, and a helicopter. It was more than 300 years before any of these were made.

The American Thomas A. Edison invented the frst light bulb in 1879. But several other men worked on similar designs before Edison did.

To keep their ideas safe and prove they thought of it first, inventors apply for a patent. The patent gives the inventor the right to make his invention or sell his idea. Edison had ore patents than anyone else – he has 1,093!

 

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Which are the inventions we see at home?

Every day we use things that make our lives easier. We flip a switch to turn on the lights. We turn on the tap and fill a glass with water. Our clothes have zippers and snaps that make getting dressed easier. We have alarm clocks to wake us.

What would life be like without lamps or zippers? How would you clean your teeth without a toothbrush or dental floss? Our homes are filled with all sorts of helpful inventions.

The refrigerator allows the modern household to keep food fresh for longer than before. Freezers allow people to freeze food and extend its expiry date for even longer periods.

A washing machine is a machine that uses water to wash laundry, such as clothing and sheets. Bendix Corporation introduced the first domestic automatic washing machine in 1937. Imagine this; this very common household appliance was not available prior to that date!

A television set, more commonly called TV, is a device used for the purpose of viewing television broadcast. It was introduced in 1920 in mechanical form.

However, the modern color television was not introduced until 1940.

The Television has become commonplace in our homes, offices, and institutions, particularly as a prime source for advertising, entertainment, and news.

 

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Why did Sir Isaac Newton stick a needle in his eye?

He did indeed. Or more accurately, he pushed a needle behind his eye and with it, indented the sclera. The needle never entered the eye.

By doing so, he stimulated his retina in many spots and noted a “phosphene” or glowing spot that resulted from the pressure. From this he was able to “map” his own retina against where he saw the spots. This map conformed to the map on the back of a rabbit’s retina that he made by shining light from a window, through a pinhole, into the rabbit’s eye that had an opening cut away from the sclera allowing him to see into the rabbit’s eye.

And thus Newton showed how the rays of light enter our eye by an optical system now called the camera design. And how the retina represents the outside world but with inversion (up is down and left is right).

Newton was a dedicated scientist who was willing to accept some pain and personal risk to satisfy his curiosity.

 

Credit : Quora

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Who invented the computer mouse?

The computer mouse was invented by Douglas Engelbart in the 1960s, and patented in 1970. Dr Engelbart who died on July 2, 2013 also invented a number of other interactive information systems that helped make the computer a user-friendly tool. Before pioneers like specialized machines those only trained scientists could operate.

The computer mouse was popularised by its inclusion as standard equipment with the Apple Macintosh in 1984.

Why was it called ‘mouse’? The object’s shape and tail-like cord suggested the name.

A year after the mouse was invented, a researcher named Jack Kelley created the first mouse pad.

 

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Who invented the escalator?

The escalator is a moving staircase that helps people to move between floors at public places like malls, train, stations, airports etc.

The first idea of “revolving stairs” was patented by Nathan Ames in 1859 in USA, but it never saw the light of day. In the 1890s, American engineer Jesse W. Reno installed an “inclined elevator” at Coney Island, an amusement park in New York City. The 7-feet long conveyor belt was inclined at a 25 degree angle. It was the first example of a working escalator. The term ‘escalator’ was coined by Charles Seeberger, an American inventor, from the Latin word scala for steps and the word ‘elevator’, which had already been invented. He joined hands with the pioneering elevator company, Otis, and produced the first commercial wooden escalator which won the first prize at the Paris 1900 Exposition Universelle in France. Soon, escalators were installed in Europe and USA. As the Otis Elevator Company held the trademark rights to the word ‘escalator’ until 1950, other manufacturers called them by different names like Moving Stairs and Motorstair. Today, Otis and Schindler are the largest makers of escalators in the world.

 

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