Early eavesdropping was not always electronic...Click on thumbnails to enlarge.
Courtesy The Museum of Retro Technology.
On a smaller scale, eavesdropping could often be accomplished by using the Speaking Tube. Yes, many homes, offices and 'fine automobiles' used to have speaking tubes. You can still find them on some ships, too. (history) Of course, this should not be confused with a Whispering Tube; a story for another day.
Want one? Click here!
