From 1890: The First Text Messages
sundaymagazine.org
sundaymagazine.org
Which, if you don't want to click through, looked like this: Wales Parisward smorning omnistation cheered stop he said friendship proFrance unceasing.
http://distantwriting.co.uk/howthecompaniesworked.aspx
The idea that management would disapprove of the informal exchanges between operators is strangely familiar today.
Edit: Yay, it looks like that merit badge still exists: http://meritbadge.org/wiki/index.php/Signaling
Coincidentally, that's the same place I learned about Wuthering Heights.