Show The Speed of Light Marvelous as was the discovery that sound impulses could be be transmitted by t telephone and radio their mere transmission would be beof of little value if they traveled only with the speed of ordinary sound I To illustrate If one were in San Francisco and desired to talk to someone in New York and had a Voice loud Joud enough to be heard that di distance it would take near near- nearly nearly ly Iy four hours for the message to cross the for continent continent for sound pound travels only miles an nn hour But fortunately electrical and radio impulses travel with the speed of light which for all practical practical cal purposes is i instantaneous for terrestrial distances or about miles es a second Incidentally it may be mention mention- mentioned I led ed that so BO far the lon longest st e-st combia- combia combined combined ed telephone and radio conversa conversation tion ever carried on by a regular toll customer was between ooh n San Diego mio California and Stockholm Sweden a distance of miles By special arrangement longer long distances have been b n covered Many improvements in telephone and radio communications will be beI made in the future but ut there will willbe willbe I be no increase in speed speed- Always I the tho sounds Bounds are arc transmitted with the speed of light the speediest st the thing in the universe |