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Off a g+ post:
https://plus.google.com/+PeterTerren/posts/Weo9gg8F5d9
The device pictured (see link) is turning away from the dark side so thermal transpiration dominates.
Data is a little hazy, ill-defined terms, and there is poor control of variables.
But I'd put it down to the the laser spectra and the absorption spectra of the surfaces.
Also reference:
How does a light mill work by Philip Gibbs July 1996 (Usernet Physics FAQ)
Note: Terrin is one of those happy individuals who loves to "play" with science equipment for entertainment but does not automatically assume some groundbreaking discovery whenever something happens against his expectations.
https://plus.google.com/+PeterTerren/posts/Weo9gg8F5d9
Peter Terrin said:The Crookes tube has vanes that turn rapidly in sunlight. Lesser lights such a 5mW green laser her also works. Also a 3 and a 40mW violet laser work well. What don't work are a 1mW red diode and 10mW red HeNe laser.
So why doesn't the stronger red laser work?
(I haven't measured the power on calibrated equipment). This doesn't make sense from a heat driven action point of view. Any ideas from the physics guys.
The device pictured (see link) is turning away from the dark side so thermal transpiration dominates.
Data is a little hazy, ill-defined terms, and there is poor control of variables.
But I'd put it down to the the laser spectra and the absorption spectra of the surfaces.
Also reference:
How does a light mill work by Philip Gibbs July 1996 (Usernet Physics FAQ)
Note: Terrin is one of those happy individuals who loves to "play" with science equipment for entertainment but does not automatically assume some groundbreaking discovery whenever something happens against his expectations.