Pye 232 radio, c 1928.
© Science Museum / Science & Society Picture Library
A two-valve domestic radio receiver with a brown Bakelite case, made by W G Pye and Co of Cambridge. When combined with a wood flour filler, phenol formaldehyde, known by its trade name 'Bakelite' after its inventor, Leo Baekeland, forms a useful mouldable plastic, with very good electrical insulating properties. It was the first plastic to be used for making radios.