The Gizmo or Gizmotron, invented in the mid seventies, was a device that allowed an electric guitar to create orchestral type sounds.
This is a youtube 10cc video of the inventors using it live in concert. That would be the person using it(LOL Creme) and the bearded fellow(Keven Godley).
Here is more info on the Gizmo.
Re: The Gizmo
What a contraption! Reminds me of my idea to make a key-played "brass section" using automobile horns, also in the pre-synth days.