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Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in box
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Metal ammoniaphone, for voice cultivation, in original box, invented by Dr. Carter Moffat, by Medical Battery Co., London, late 19th century
Metal ammoniaphone, for voice cultivation, in box, invented by Dr. Carter Moffat, manufactured by Medical Battery Co., London
Advertisement and instructions for use for the ammoniaphone, by Medical Battery Co., London, New York, Paris, Melbourne and Berlin
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