Best books on telegraphy

I recently read The Victorian Internet, which

discusses the development and uses of the electric telegraph during the second half of the 19th century and some of the similarities the telegraph shared with the Internet of the late 20th century.

I highly recommend this book. The parallels Standage draws between the intercontinental telegraph system and the Internet provide a wonderful framework with which to think about current events.

Does anyone know of any other good historical books on telegraphy? Bonus points for those which relate back to today's networks.

(Sorry if this isn't the right subreddit - I hope the tangential relation is enough to be allowed here)