A telegraph uses an electric circuit to send a message. When the telegraph operator presses on the device, the circuit switch is on, and when the device is released, the circuit is turned off.
How is the technology to send a telegraph like modern digital technology?
The telegraph sends information as a continuous wave.
The telegraph uses the standard alphabet to send information.
The telegraph sends information as a series of pulses.
The telegraph uses sound waves to transfer information.
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