From Midlands 2018

TWO PENDULUM HARMONOGRAPH

The harmonograph has been a popular project for model engineers since the first workshops were set up. Even in these days of advanced technology, they hold their fascination. You can probably achieve a similar result on a computer printer, but where’s the joy in that? This delightful one was on show at the Midlands Exhibition in 2018.

https://www.sarikhobbies.com/model-engineer-builder/