the telephone

The telephone is a curious invention made by Alexander Graham Bell. It works by vibration which is a movement caused by sound.      

Today I made a telephone with tin cans and a string. you can do it too!

Simply take a tin can and have an adult poke a small hole in it. Then you carefully slip the string in and tie it make sure the knot is big enough. If it isn't tie one more time. Do the same with the other can. Have a friend stand as far as he can go and hold the telephone to his ear. Talk through the telephone while your friend is listening and remember to have fun!