Telegraph timeline: Choose the decade of invention for the electric telegraph. Context: Consider Cooke–Wheatstone and Morse work leading to first practical systems. Choose the correct decade.

Difficulty: Easy

1830s
1840s
1820s
1850s

Correct Answer: 1830s

Explanation:

Given data

Key demonstrations and patents occurred in the 1830s (e.g., 1837 for both Cooke–Wheatstone in Britain and Morse in the U.S.).

Note
First public lines and famous messages (e.g., 1844) followed soon after, but the invention decade is the 1830s.

Final Answer
1830s.

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