Showing posts with label devices. Show all posts
Showing posts with label devices. Show all posts

Did the ancients have mechanical watches?

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Antikythera is a Greek island about 40 km from Crete. In 1900, divers discovered the remains of an old ship near Antikythera. In the sh...

How does a thermometer work?

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   The thermometer on your wall is a glass tube with a silvery or red or blue line inside. The silvery line is a liquid called mercury. Si...

How does a periscope work?

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A periscope is constructed and functions similarly to a telescope, with a long tube containing a mirror at each end. The mirrors are moun...

How can an x-ray see inside the human body?

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X-rays are like ordinary rays of light, except for one thing, they have a shorter wavelength. Because of this, a beam of this length has mor...

How does the air conditioning work?

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An air conditioning machine controls more than the temperature of the interiors. It also controls the amount of moisture, movement, and p...

How does a soldier see in the dark?

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The night sight can turn night into day for the soldier, which means that darkness no longer protects the adversary. The night sight allo...

What was the biggest bicycle in history?

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During the 1890s, a group of artists traveled through Europe and America with a giant bicycle they proclaimed was the largest ever built....

How does a Geiger counter work?

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The Geiger counter is a device used to know how much radioactivity is present in a substance or in a finished area. The counter works in...

Where does the boomerang come from?

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For the past ten thousand years, Aborigines in Australia have used a type of weapon called bumerangs to kill the animals and birds they fee...

How does a barometer work?

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aneroid barometer The air also has its weight, and like all other bodies exerts a pressure, by the effect of gravity, on the earth'...

The gyroscope toy

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   A toy gyroscope spins like a top. In fact, this toy is often called a gyrotop. The chief parts of the gyrotop are a wheel which is wei...

Electron microscope

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   The electron microscope is an instrument which permits scientists to see and photograph objects too small to be seen with an optical M...

What is a compressor?

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   A compressor is a device that compresses a gas or vapor. Compressors provide the supply of compressed air for jet engines, paint spraye...

What is a dehumidifier?

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   A dehumidifier is an apparatus far removing water vapor from the air. A room dehumidifier is a small, portable unit that can be placed ...

What is a Volmeter?

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   A voltmeter is an instrument used to measure the voltage or difference in electrical pressure between two points of an electrical circ...

Optical instruments

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   Optical instruments are devices in which light is passed through lenses or prisms. Among the common optical instruments are the microscop...

What is a speedometer?

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   Scientists and engineers have mastered the measurement of distance - from fractions of a millimetre to thousands of kilometres. And t...

Flowmeter

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   A flowmeter is a device that measures the rate of flow of a liquid or a gas. The commonest flowmeter is called an orifice meter.    An o...

What is a fluorescent lamp?

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   A fluorescent lamp is a source of artificial light produced by bombarding a phosphor with ultraviolet light. The phosphor is the heart ...

What is an incubator?

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   A chicken egg in order to hatch must be kept warm. A mother hen sits on her eggs to hatch them. Her body keeps them just warm enough. But...