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Mackenzie's first polygraph, in case, complete

Polygraph, made by Jaquet of Switzerland, no.21171, mahogany box, imported by Hawksley and Sons, London, 1920-1940

Polygraph, made by Jaquet of Switzerland

1910-1930

Tambour and pointer from Sir James Mackenzie's polygraph, c.1900

Tambour and pointer from Sir James Mackenzie's polygraph

1892-1925

Mackenzie-Lewis polygraph, in case, by Cambridge and Paul Instrument Co., London, c.1920

Mackenzie-Lewis polygraph

1919-1930

Polygraph or tonoscillograph by Boulitte, Paris, 1880-1930

Polygraph or tonoscillograph by Boulitte

1880-1930