while waiting for the rain to stop let's see if we can find out like fun now the romans used horses yes about one hundred twenty five years ago samuel morse invented the telegraph a way to send code messages over an electric wire the code was made by using different clicks for each letter of the alphabet first message sent over forty miles of wire was as god wrought the telegraph was and still is wonderful but mr mann wanted to send his voice over a distance to carry on a real conversation then an eight hundred seventy six a man named alexander graham bell found a way he invented the telephone well how does it work how did your mother's voice get in the phone that simple it's just funny i don't know i never thought about it before we were talking as if we're in the same we'll pretend now he's a musician all sounds come from a movement of the air back and forth like waves i don't see any way during move back and forth i have seen  rubber bands move back and forth but i've never seen a sound when you can really see them the hear them could see them they look like this different kinds of sounds make different kinds of sound wa you see people's voices make sound waves to when we speak air from our lungs moves vocal cords like these in our throat probably all this movement makes sound waves and sends them out of our mouths when sound waves reach the ear of another person they make the drum and his ear move back and forth and he hears a sound the other person is making them we're coming to that when mr man speaks into the telephone the flow of electricity in the wires makes it possible for the other person to hear what mr man is saying just as quick as a flash well when he is dial his friend and his friend rudolph answers the flow of electricity in the wires connects mr man's telephone through the telephone building to his friend's phone oh mr man's vocal cords make sound waves which go into the mouthpiece of the telephone the sound waves make the electricity flow stronger and weaker depending on the sound waves his voice makes remember now that the flow of electricity is changing from strong to we as it comes from mr man's telephone these changes work on the receiver very much the way sound works on your ear drum the electricity makes a little metal plates vibrate this fiber ation makes sound waves come out of the receiver and so in a split second the person on the other end of the line he was the same worries mr mann is speaking and  he hears sounds just like mr man's voice you shouldn't play around the telephone somebody may be trying to oust the somebody was trying to cause bill matthews i'm sorry but this is five five five three seven five nine i shouldn't lose my temper even when people roar into the telephone at me all the way back by itself each number all the way down let's go see to keep the phone numbers of people who call often like your friend bobby she wants to be everything when she hears the emergency post she wanted thanks i think jimmy and susie would like to know how valuable the telephone is an emergency you come inside for a minute no show you we want to use this is show children how to get help in an emergency you dial zero to get the telephone operator remove your finger and let the dial go back you dial zero once and the operator will answer then you say i want to policeman plays and the operator will connect you with the police station  somebody like the sergeant here answers you tell him who you are where you are and why you're calling the police last and how long has she been missing what was she wearing out an all points bulletin five year old girl last linda hoskins flash scene on elm street here's a description this is officer jensen six in elm street that's what i'm calling you know but he was all alone looking a little a store window sure she's fine good work officer there is a telephone building in many ways it ties the community together when you dial a number this equipment inside the telephone building automatically come next year with the person you're calling whether he's across the street or miles and telephone service wouldn't be complete without people to handle special calls on the emergencies let's hear the operators are saying mr hanson please long distance calling i'm sorry the line is busy i keep trying  is i'm sure you'll be here soon jet plane flies a lot higher and faster than black or can telephone reach into the sky they can and they do and even more amazing than working with communications satellites to orbit the earth the satellites can carry telephone messages and television pictures to and from many different parts of the world yes jimmy outer space to land himself his energy space flight  yes and just think jimmy and susie some day in the future you might pick up a telephone and soon be talking with your friend even if he's on the moon