Bell and the Science of the Telephone (Explosion Zone)
(back cover)The Explosion ZoneBelland the Science ofTHE TELEPHONEWhat the scientists say:You can make a simple telephone using metal cans and a piece of string.Sound can be sent by light signals in fiber optic cablesThe cone shape of a bullhorn or megaphone stops sound waves spreading out too quickly and makes them travel further.Cell phones transmit your calls by radio wavesTITLES IN THIS SERIES:Bell and the Science of the TelephoneCurie and the Science of RadioactivityFaraday and the Science of ElectricityThe Wright Brothers and the Science of Flight--This text refers to an out of print or unavailable edition of this title.