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Mackenzie's ink polygraph, by S. Shaw, England, 1905-1915

1905-1915

Polygraph, miniature, with accessories

1900-1939

Polygraph, United Kingdom, 1960-1970

1960-1970

Mackenzie-Lewis polygraph, London, England, 1919-1926

1919-1926
8 channel polygraph, model 7D, with accessories including connectors, electrodes, charts and consent forms used in psychophysiology, guided imaging and aversion therapy work at Warley Hospital, made by Grass Instruments, Quincy, Mass., USA 1970-85.

8 channel polygraph

1970-1985
Gibson polygraph in wooden case by Hawksley and Sons

Gibson polygraph in wooden case by Hawksley and Sons