How To Make Homemade Stethoscope

A stethoscope is a device widely used by doctors to hear the heartbeat.It was invented by a Frenchman named Rene Laennec in 1817 and has three types: acoustic stethoscope, which is the most common electronic stethoscope, which makes use of electronic amplifiers to better detect sound, and a fetal stethoscope, which is used in women pregnant to hear the baby’s heartbeat.Although different, the three stethoscopes have the same objective, to examine patients’ hearts and lungs to make sure they work properly.

A stethoscope is also useful to teach children about sound waves and how they can travel even in tight spaces. It is for this reason that often asks students to make a homemade stethoscope for work of science.

The materials needed to make a homemade stethoscope are as follows:

* Large Funnel
* Funnel small
* Long plastic tube or hose old
* Tape
* Rule

Prepare the sleeve
To make your own stethoscope, start measuring about 50 centimeters of the tubing.
If you have a plastic tube, you can use a garden hose old. Just make sure you clean it well before using.
Once you finish measuring, short sleeve tube or hose.
The garden hose may be too hard to cut, you will need a sharp knife. Be careful to avoid accidents should do an adult.
Attach funnels
Now that you have the tube, get a small funnel and insert it into the tube end. Make sure you stay well and then seal it with a strip of tape.
Take the large funnel and place it at the other end of the tube, too tight.
Throw a little funnel to make sure each subject and placed correctly.

Get ready to play
To test this, try to do some aerobic exercises like running or jumping for about 10 minutes.
Large funnel placed firmly on your chest and small funnel to hear the heartbeat. Count how many beats can be heard in a minute and write data.

Rest for 5 minutes or until your heart rate returns to normal. Retells the number of beats you can hear for a full minute. Write the data back and compare the two together.

This is the perfect way to learn about heart rate. Explain why the first data differ with others.