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Webster's Dictionary (1865)

Te-lĕg'ra-phy, n.

noun

n. [Fr. télégraphie, It. telegrafia. The science or art of constructing, or of communicating by means of, telegraphs; as, submarine telegraphy. Ed. Review.

The illustration shows several cross-sections of a submarine telegraph cable alongside a longitudinal view of the cable’s layered construction.
Sections of Submarine Telegraph Cable.