[YOUTUBE="Y6LdXIkRJRE"]Not floating, but a nice example anyway.[/YOUTUBE]
I once pondered a novelty (Spencers type) based on this sort of Induction at a distance. Having a little snow globe sitting in a base with lights and fountain inside. You could pick up the globe and all stopped
Under the plywood table in the video is a coil similar to the one below the light. Passing AC current through the coil unseen produces fluctuating lines of magnetic flux that 'Induces' a voltage in the lamp's coil above.
Originally Posted by Antimony
Aghhh, my inventive heart!
Hey, no need to feel crestfallen about someone else connecting dots before you. How many people play with magnets and think nothing?
I once made a Spencers type novelty that would be an Acid Dropper's Dream. It used the phenomenon of Birefringence (The same optical physics that causes rainbows to appear from a few drops of motor oil in a mud puddle).
I filled a one liter round bottom flask with mineral oil and clear plastic confetti made from cigarette pack wrapper acetate. Then I corked the top with a DC motor wrapped in duct tape to size that had a small length of wire crazy glued to the motor shaft to act as a whip stirrer. Then I inverted the Flask in a make-shift stew can base and wired the motor to a 3VDC power pack and plugged it in. I then sat this 'Orb' in front of a photographers light box sat on end (Think doctors looking at X-Rays) with a sheet of polarized film from Edmund Scientific taped to the front of the box.
In operation, you would just see a glass orb with the clear confetti whirling about in a clear liquid. However, if you put on a pair of polarized sun glasses the confetti became brightly colored. The color depending upon how many layers of confetti the light passed. One layer being a Royal Blue. every color of the rainbow could be had as the spectrum repeats as the layers add up.