Physiograms Revisited

by Jools Gowans February. 15, 2009 4063 views

I was in an experimental mood tonight.

This medley of physiograms were created by suspending two LED lights from the ends of a coathanger which was itself swinging on a 2ft long piece of string.

As you can see, there are plenty more degrees of freedom in this setup which create a greater variety of shapes but with more ‘chaos’ - they look hand drawn compared with the regular patterns from the simple pendulum.

Back to a simple oscillator setup here - the LED light was set to shine the red and blue LEDs constantly but when viewed from different angles the colour appears to vary between the two.

The cat's been at the wool again!

Back to the experimentation. I set up a complex oscillator by tying an 8oz weight halfway down the string and a 2oz at the bottom next to the LED light.

The larger weight kept a general circular swing going whilst the smaller weight varied the eccentricity of the orbits. In other words, the pretty line keeps changing between a circley thing and a sort of triangle.

My slinky's gone wrong!

This time I had just the 8oz weight at the end of the string and the LED light on its own lanyard beneath it. The first swings started off chaotically but the system soon settled down.

I discovered that where the knot in the string around the light fitting was loose, the knot would slip whenever the swing went LR which had the effect of slowing the procession and attenuating the amplitude.

Sorry if I sound too much like a physicist!

Ball of String?

Back to the simple system again with the LED tied to the 8oz weight.
I'd sorted the slippy knot out and things were looking more rounded again.

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Susan 11 years, 5 months ago

Beautiful - fun post!

11 years, 5 months ago Edited
Helen Hooker 11 years, 5 months ago

Amazing effects! Reminds me of the Spirograph I had as a child!

11 years, 5 months ago Edited
Mehdi Saharkhiz 11 years, 5 months ago


11 years, 5 months ago Edited
Afroditi 11 years, 5 months ago


11 years, 5 months ago Edited