Gecophone loudspeaker in black vulcanite, early pattern horn type, by General Electric Co. Ltd, 1920s

Loudspeaker in black ebonite, on three feet, made in England by the Western Electric Co. Ltd

Amplion loudspeaker for radio reception, type A.R.39, serial no. 26918, aluminium horn, made by Messrs Alfred Graham and Co. London

Rice-Kellogg loudspeaker, B.T.H. 1926 pattern, transformer missing

Sterling Mellovox type loudspeaker, the first of the cones made by the Sterling Company

Brown horn type loudspeaker, patent 29833-10, with mahogany base

Loudspeaker by S.G. Brown, type H.4. 1926

Loudspeaker, Amplion Radiolux type R.S.I.M., c. 1926, fitted with a type AU.1 unit in a polished cabinet

Loudspeaker, cone type in a circular bakelite casing, Philips of Holland model 2007, c. 1928

Loudspeaker, moving-iron cone type, type E form B by B.T-H. Company

Loudspeaker, Allison type moving iron, by C.A. Vanderwell of Acton, c. 1924, with an impedance of 2000 ohms, and a horn made of metal and celluloid coloured to simulate tortoiseshell

Loudspeaker, Dragon type AR114 by Amplion, c. 1926, with a segmented oak horn and fitted on a circular metal base

Loudspeaker, Junior R1293 by Magnavox of the U.S.A., horn type, energised field, and fitted with an input transformer

Two loudspeaker units, Blue Spot, with a permanent magnet, a curving coil, and a frame finished in a light bronze colour with plastic magnet cover pieces

Loudspeaking telephone (loudspeaker) made by S.G. Brown Ltd of London about 1921

Chrystavox horn loudspeaker for radio, with a die-cast metal base and painted in brown gloss, by S.G. Brown, c. 1930