A workable one.
The photo above shows something created by E A Johnson in 1965 at the Royal Radar Establishment in Malvern, United Kingdom. Quite ahead of its time, the concept was soon adopted by air-traffic controllers in the UK, and remained in use till the 1990s. Today, a large chunk of mobile phone users encounter this technology regularly.
This was the first example of what? And it’s really easy to work out from the image, despite its quality.
Happy quizzing, and have a nice life, folks!
Three answers, and all correct! This is indeed the world’s first touch screen.