Twin Elliptic Harmonograph

[@lesliemiller5887]

The original Exploratorium in San Francisco had one of these I remember being fascinated with in the late '60s.

[@lank_asif]

That device is amazing. Please post more

[@rickhall4444]

Glad you like it, thanks. See more examples at www.rickhall.co.uk

[@dmithsmith5880]

The old ink burner 2000.. Nice rig ! she holds a real tight line.

[@lank_asif]

dmith smith Hahahahaahaaa!! Thanks for the laugh - A literal LOL for once

[@aaronspain1735]

may I ask you how heavy both your top and bottom bob are? that's a very beautiful design that you created. what a feeling that must have been when it started and only got better and better i can imagine.

[@ricardrinaldo4791]

very cool