Show THE SPEED OF LIGHT marvelous as was the discovery that sound impulses could be transmitted by telephone and radio their mere transmission would be of little value if they traveled only with the speed of ordinary sound to illustrate if one were in san francisco and desired to talk to someone in new york and had bad a voice loud enough to be heard that distance it would take nearly four hours for the message to cross the continent cont inert for sound travels only miles an hour but fortunately electrical and radio impulses t travel ravel with the speed of light which for all practical purposes I 1 is instantaneous for terrestrial distances or about miles a second incidentally it may be mentioned that so far the longest combined telephone and radio conversation ever carried on bya by a regular toll customer was between san diego california and stockholm sweden a distance of miles by special arrange ment longer distances have been covered many improvements in telephone and radio communication will be made in in the future but there will be no increase in speed always i the sounds are transmitted with the speed of light the speediest ediest thing in the un iverse |