Polygrapher. P.78.
Photograph: David Remes (2003)
In 1778-79 Darwin continued his work on a copying machine and perfected a ‘polygrapher’ – a model working on the pantograph principle. It was able to duplicate writing and drawings, and produced an identical copy. In this variant the pen was not stiffened, and the height of the machine was reduced.
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Erasmus Darwin’s Commonplace Book
The Scope and Nature of Darwin’s Commonplace Book
Artificial bird. P.32, 38.
Bigrapher. P.53.
Canal lift. P.58-9.
Diving bell with washed air, pneumatic. P.61.
Polygrapher. P.78.
Electrical doubler. P.79.
Rocket motor. P.82.
