Stethoscope

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a medical instrument for listening to the action of someone's heart or breathing, typically having a small disc-shaped resonator that is placed against the chest, and two tubes connected to earpieces.

The stethoscope is an acoustic medical device for auscultation, or listening to the internal sounds of an animal or human body. ... It is often used to listen to lung and heart sounds. It is also used to listen to intestines and blood flow in arteries and veins.

stethoscope is a medical device that is used, generally, by doctors, nurses and other medical professionals. They use it predominantly to perform checks on the heart and lung functions. These checks are called auscultations. Thanks to a stethoscope medical professionals can easily hear if your heart or lungs function properly. 

Usually heart function and lung function sounds routine and clean. So if there are any murmurs that occur during the auscultation, the medical professionals will know something is up and further investigation is needed.

To a lesser degree mechanics also use stethoscopes. During the running of an engine stethoscopes can be used to determine any faults that might happen in the cylinder of a combustion engine. Unfortunately you cannot open a cylinder during a running engine to check out faults as this would intervene with the normal functioning of an engine.

Therefore a stethoscope allows them to perform diagnostics on the engine. Much like a medical professional with a human body.

Different types of stethoscopes

Acoustic

Probably the best known stethoscope-type. They operate on the transmission of sound from the chest piece to the listeners’ ears, via air-filled hollow tubes.

Electronic

The main function of these types of stethoscopes is that they convert analog sound signals into digital ones. This can be achieved in one of two ways.

Fetal

A fetal stethoscope or a fetoscope looks a lot like the old listening trumpet. The device works by placing one end of the stethoscope on the pregnant woman’s abdomen

Doppler

A doppler stethoscope works using the famed doppler-effect. Motion is detected by the change in frequency of the soundwaves.