John prepared stethoscope with paper cup and plastic tube. Write down the procedure of preparation?

Explanation

Aim : To prepare a paper cup stethoscope.
Apparatus : Three paper cups, plastic tube, scissors, T-bend and thread.
Procedure :
1) Take three paper cups and put a small hole in the bottom of the cups.
2) Take a T - bend and arrange it in the back side of one cup as hanging.
3) T - bend is connected to plastic pipe, by the two sides and arrange the paper cups.
4) Put the two upper cups at your ears and bottem one is on the friend's chest.
5) Now you can hear the sound of heart beat.