Harmonogram. This unique pattern was created using a device called a two-pendulum harmonograph. This piece of equipment consists of two pendulums,each suspended from a universal joint,with one pendulum hanging lower than the other. In this case,the higher pendulum had a camera attached to its base,while the lower pendulum had an LED that pointed up at the camera when at rest. In a blacked-out area,both pendulums were set swinging. The camera shutter was opened before the LED was switched on. After about a minute,the LED was switched off and the camera shutter closed. Harmonographs were pioneered by the French physicist,Jules Antoine Lissajous in 1857 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Hart-Davis, Adam |
Taille de l’image : | 4103 px × 4370 px |
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