Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 10, 2025
Under the right conditions it can be made to speak exactly as the famous 'speaking-arc, as it was called by Professor Duddell, who investigated it. Both the arc- light and the metal-filament lamp can be made to act as telephone receivers." It seemed unbelievable, but Kennedy was positive.
"In the case of the speaking-arc or 'arcophone, as it might be called," he continued, "the fact that the electric arc is sensitive to such small variations in the current over a wide range of frequency has suggested that a direct-current arc might be used as a telephone receiver.
Word Of The Day
Others Looking