This is the way you would have listened to the B.B.C. in its infancy. The idea was that you got your room set up as shown here with your wiring out of the window and sat silently on your own listening in. However this was not actually the way it worked out, and almost immediately it was discovered that it was not going to be such a solitary occupation. This meant that there was a bit of a flaw to their system.
However there was a simple solution, which you will find out when you "tune in tomorrow"...
This equipment was often called a "Crystal" Set. This was because a quartz crystal was part of the set, and you slid a very small wire, known as a cat`s whisker, along from the crystal. This lengthened and shortened the coil and tuned you in to the station. If you heard the slightest sound in your earphones you would go backwards and forwards until it grew ever stronger.
The building of ones own equipment is something which appeals to me immensely, even though most of it is done by guessing because I struggle with converting written instructions on a page into doing things with a three dimensional object. It is much better for me to see a picture, like on the front this card, and to handle things to find out how they fix together and work. Needless to say I would probably have never turned the card over before it was humming into action. Printed road maps are the same for me too, so if you are similarly challenged here is a friendly tip - just go along the route beforehand visually on google maps and somehow as you drive along the pictures of the places you need to turn at just pop back into your head. This is especially true if they are brightly or differently coloured, so many thanks to anyone who paints the outside of their house in such a way...