'How to build a two valve set', No 21, Godfrey Philips cigarette card, 1925.
© Science Museum / Science & Society Picture Library
The reverse of the card reads: 'Battery Connectons (Contd). The five battery connections are now all fixed to their terminals inside the set. The other end of the 5-way cable is pased through the hole in back of cabinet. The red and black wires should be terminated with spade terminals of the same colours, and the brown, green and gold leads should have wander plugs attached. Care should be taken to ensure that the ends of the wires make good contact with the plugs and spade terminals. Lisenin Positive Grip plugs and terminals are recommended.'