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An instrument for measuring the speed of the wind, or of any current of gas.
Anemometers measure wind speed by the amount of wind pressure against a surface, such as a cup or a propeller, or by using sonic pulses.
A mechanical anemometer contains a wheel with cups or a propeller at the end of the spokes of the wheel. One of them contains a magnet. Each time the magnet passes a switch, it makes a recording. This can give an extremely accurate reading of the wind speed.
There are several types of anemometers as well. A Sonic Anemometer, for example, uses disturbances and sound waves to calculate wind speed. It has no moving parts and relies on sonic pulse technology to measure both wind speed and direction.
There are also Laser Doppler anemometers, plate and tube anemometers, wire anemometers, vane anemometers, and other designs.
The Davis mechanical anemometer has sealed, stainless steel ball bearings that give it a long life under continuous use. It is rugged, but it is also accurate enough to measure the lightest breeze or change in wind speed.

An Electrocardiogram (ECG or EKG) is a test that checks how your heart is functioning by measuring the electrical activity of the heart. With each heart beat, an electrical impulse (or wave) travels through heart. This wave causes the muscle to squeeze and pump blood from the heart.

Gravimeter. Gravimeter, also called gravity meter, sensitive device for measuring variations in the Earth’s gravitational field, useful in prospecting for oil and minerals. In one form, it consists of a weight suspended from a spring; variations in gravity cause variations in the extension of the spring.

Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.

‘Photometer’ is used to determine the intensity of light.

Louis Charles Breguet invented quadcopter.

Swiss chemist Paul Hermann Muller discovered DDT (dichloro-diphenyl-trichloroethane) noted its effectiveness as a pesticide during World War II to control malaria and typhus among civilians and troops, a discovery that earned him a Nobel Prize in 1948. It was first synthesized in the year 1874.

Christiaan Eijkman was a Dutch physician and professor of physiology whose demonstration that beriberi is caused by poor diet led to the discovery of antineuritic vitamins (thiamine). Together with Sir Frederick Hopkins, he received the Nobel Prize for Physiology or Medicine in 1929 for the discovery of vitamins.

On December 17, 1903, Wilbur and Orville Wright made four brief flights at Kitty Hawk with their first powered aircraft. The Wright brothers had invented the first successful airplane. The Wrights used this stopwatch to time the Kitty Hawk flights.

In fluid dynamics, the Mach number is a dimensionless quantity representing the ratio of flow velocity past a boundary to the local speed of sound. where: M is the Mach number, u is the local flow velocity with respect to the boundaries, and c is the speed of sound in the medium.

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