[time-nuts] Antique precision timing device without electronics

[Hal Murray]

eric at scace.org said:
>    Frequencies around 15 Hz were common on early 20th century cables,
> depending on the degree of success in compensating for the inherent
> capacitance on a cable thousands of miles long surrounded by conductive
> sea water.

Is the sea water relevant?

Does enough energy leak through the shield so that it matters?  How well does 
coax work at low frequencies?

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