On June 21, 1880, Bell's assistant transmitted a wireless voice telephone message a considerable distance, from the roof of the Franklin School in Washington, D.C., to Bell at the window of his laboratory, some 213 metres (700 ft) away, 19 years before the first voice radio transmissions. COUNT 4
QSN1 Bell and his assistant first used their photophone on what date? ANS1 June 21, 1880 QSN2 How many feet did the first photophone message travel? ANS2 700 QSN3 From what building was the first photophone message sent? ANS3 Franklin School QSN4 How many years after this photophone message would the first message take place over radio? ANS4 19