hi! there's lots of room for more input (especially an overview of the development & adoption of electrical telegraphy), but meanwhile, I thought you might be interested in some previous posts on various aspects in the early development:

• How fast could messages travel in the past?

• How did the telegraph industry respond to the creation of the telephone and to radio? What changes (in terms of rates and services) were made to compete? When was the telegraph made obsolete?

• How much did a telegram cost during the American Civil War, and can you put that price into context?

• How were long-range telegraphs powered during the American Civil War?

• How were Telegraph lines maintained in the 1800s?

• What would the reaction to things like the electrical telegraph have been by some of the lesser educated people in Victorian England c. 1850?

• How was a trans-Atlantic telegram cable built with mid-19th century technology?

• How difficult was it to lay the transatlantic telegraph cables?

• How were the first transoceanic cable laid ?