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Show . f1 { , THE SPEED OF LIGHTMaveIOis LIGHT LIGHTMarvelous Ma Marvelous MaveIOis velo s ) as \ was \ as the discovery dlsovery : that sound lm- lm mu- mu lmpulSes mupuises im impulses - pulses puises c cduld could uld be transmitted tral1snutted tran.snutted transnutted . , by telephone and radIo radiotheir , ther.r therr their . mere . . . transmission \ would \ ould be of little value If Ifthey ifthey itthey they traveled only onlyuth onlyIth \ \uth uth \\Ith Ith with \ the speed of ordinary ordmary sound round . a . To illustrate lustrate ; : If oneere one \ were \\ere ere in m San Francisco FranClsco and anddesued anddesired anddesired desued desired to talk t to ty ' someone in New York , and had a avoice avoice avoice voice fcud Icud l ud enough t to : > be heard that distance , 1t it 1twould itwould itwould would take neail neall ieail four hours for the message to tocross tocross tocross cross the cont1hent-f cont1hent f contthen-ftr contthen ftr continent - - fcr r sound travels only 720 mlles miles mllesan milesan milesan h hohr hhr hr an , " , :7 7 : :7B y ' 'Wr Wr y'Wr ' ? ' B B'rtunately Brtunately But 'f f 'fItunately " . ' fortunately Itunately , electrical electncal and radio radlo Impulses Impulsestravel impulsestravel impulsestravel impulsestravelith travel \ ' \\ith ith 'auth auth \ \ lth the seed speed ? ; of light , v . which \ hich for all practical practicalpurposes practicalpurposes practicalpurposes purposes is J5 instantaneous lDstantmeous mnstant3neous : for terrestrial terrestnal distances dIstance.s . , or orabout orabout orabout about 186 186000 00 000 { ) miles a secondIncidentally secondIncidentally second secondIncidentally Incidentally , , it ma be mentioned that ' so 50 fai fal the thelongest thelongest thelongest longest combined teIeph telephone ne and radio conservation conservationever conservatione conservationeer e\ e eer \ er carried on by a regular toll customer \ was as be- be bet between be-Ueen be Ueen - - t\\ t \ teen tween een San Diego Dleg : > . , California Cal1forrua , and nnd Stockholm , S\\ S Swe- Swe Sweden Swe Se Sweden \ \ e- e eden - - den den , . , a dI distance tance of 8 8630 630 miles mUes By special spec1al arrange arrange- arrangement arrangenient arrangement - ment nient longer di distances tances ha ha\ ha habeen \ been Co\ Co covered Coered \ ered , |