The polygraph was an American invention patented by the Polygraph Company, Philadelphia, USA, on 8 December 1885. A licence was granted the following year to George Delgado for the manufacturing of the polygraph in Europe. A licence was granted the following year to George Delgado for the manufacturing of the polygraph in Europe. We are offering one of Delgado's items. The polygraph was advertised by the manufacturers as 'A Revolution in Drawing' and was aimed at designers, decorators, draughtsmen, architects, engineers and artisans. It was also described as an invention by which schoolchildren and even 'a child of few years' could 'produce drawings, which formerly required long months of study and preparation'. The polygraph offers an element of surprise in the unpredictable patterns it creates. It also helps to produce an evenness and regularity when producing the pattern that would be difficult to achieve freehand.The polygraph was advertised by the manufacturers as 'A Revolution in Drawing' and was aimed at designers, decorators, draughtsmen, architects, engineers and artisans. It was also described as an invention by which schoolchildren and even 'a child of few years' could 'produce drawings, which formerly required long months of study and preparation'. The polygraph offers an element of surprise in the unpredictable patterns it creates. It also helps to produce an evenness and regularity when producing the pattern that would be difficult to achieve freehand.
Diameter. 12 mm. (4.60 inches).
Good used condition.