pantograph controlled by disc

This is a new take on our old friend the pantograph, it is controlled by two arms that follow the edge of a lobed cardboard disc



This disc has been cut in such a way that the pen writes the letter 'A'



this shows various early attempts to get the shape of the disc right



The disc is rotated by hand, the arms that follow it are counterbalanced with pennies, they support the weight of the drawing arm



Weights hanging over the edge of the table on bits of cotton keep the arms pressed against the edge of the disc

movie
another movie


Consul the educated monkey: similar mechanism


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my email is davidvwilliamson@hotmail.com