English: Estimated propagation velocity from 0.1Hz to 1kHz for the 1928 Newfoundland-Azores 1928 Submarine Telegraph Cable. The dashed curve is the estimated velocity that the cable would have without inductive loading. The operating frequency of the cable was roughly 10 to 400 Hz. The cable used variable loading ranging from zero near the ends to 200 mH per nautical mile.
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