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Interesting fact of the day: The same effect that cuased light in a prism to split up into different colors is what ultimately caused the first transatlantic telegraphic wire in 1858 to fail.
Morse code is transmitted as on-off signals, effectively square waves. Square waves are in fact made up of many different frequencies. Like in a prism different frequencies move at different speeds through a wire. Therefore as the on-off pulses traveled through the transatlantic telegraph wire the signal spread out like it does in a prism and ultimately the pulses would overlap and be indistinguishable.
The effect was so extreme that it took a message of only 98 words (the first message sent) over 67 minutes to send one way and a whopping 16 hours to confirm the message.
Whitehouse, a doctor with little mathematical understanding, thought he could solve the problem by increasing voltage, which we now know was a futile effort. He increased the voltage to the point he managed to short out the cable entirely and made it useless. However Lord Kelvin had already warned of the problem as was ignored and he came up with the law of squares to describe the problem which later was refined to give us the telegraphers equation. The telegraphers equation is still used today to model feedlines in radio transmitters and receivers.
Correct as was the norm at the time. Telegraph wires, atleast before they starded duplexing and quadraplexing them (which came later) were simply a dc signal that directly correlated to the morse. Dots and dashes were just direct DC pulses.
@freemo @crackurbones @Science Do you know what DC voltage they use(d)?
@Willy
60 volts would have been enough as it didnt work for reasons unrelated to voltage. They used 500V due to a lack of understanding, when the cable didnt work whitehouse increased voltage thinking it would fix it (it wouldnt at any voltage). He increased it to something around 2kV or more before the increased voltage caused the cable to fry and become useless..
@crackurbones @Science