[clbrmbr]

How they tested the cable during laying:

> At least once in every five minutes the cable was used as a condenser. A charge from a battery of about one hundred cells was given and in turn discharged through a properly shunted Sullivan galvanometer and the “throw” of the needle carefully noted.

Note that “condenser” means “capacitor”.

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Another good read is the biography of Oliver Heaviside who is famed for his (armchair) contributions to both wireless and subsea communications!