Ivory 200 series dial telephone, c 1935.
© Science Museum / Science & Society Picture Library
In 1930 improvements in microphone design and the availability of new types of plastic made it possible to design a telephone where styling was as important as technical performance. This telephone was one of the earliest designs in Britain to use thermosetting plastic on a large scale, and allowed a choice of colours to be offered to the customer. Colours other than black, however, required an increased rental charge. This example is in ivory-coloured plastic.