XPost: alt.home.repair, uk.d-i-y, alt.sci.physics   
   From: William_Gothberg@internet.co.is   
      
   On Mon, 31 Dec 2018 12:36:09 -0000, Daniel60    
   wrote:   
      
   > William Gothberg wrote on 20/12/2018 11:34 PM:   
   >> On Thu, 20 Dec 2018 07:09:59 -0000, Daniel60   
   >>  wrote:   
   >>   
   >>> Mark Lloyd wrote on 20/12/2018 3:21 AM:   
   >>>> On 12/19/18 6:01 AM, William Gothberg wrote:   
   >>>>   
   >>>> [snip]   
   >>>>   
   >>>>> They probably are fairly crude.  I know they flicker, for example if I   
   >>>>> use my cordless drill, the chuck appears to spin the wrong way under   
   >>>>> the LED lighting.   
   >>>> I remember seeing that with a washing machine (under fluorescent   
   >>>> lights). As the tub was slowing down, the row of holes around the tub   
   >>>> would appear to reverse direction. Same thing with (spoked) wagon wheels   
   >>>> in movies.   
   >>>> ... and, in real life, the Mag wheels of some cars seem to be spinning   
   >>> backwards, dependant on the speed at which the car is travelling!!   
   >>   
   >> In real life?  I assume you mean under streetlighting.  That effect   
   >> can't occur with a steady lightsource such as the sun.   
   >   
   > No, I'm sure I've noticed it in sunlight, as well.   
   >   
   > And my 'real life' was to distinguish from the mentioned "wagon wheels   
   > in movies"!   
      
   There is no way you could observe reverse rotation with the naked eye and a   
   constant light source such as the sun.  You need a light source that   
   illuminates intermittently, the timing so that the spokes have moved quite a   
   distance, so you assume they    
   moved backwards.   
      
   --- SoupGate-Win32 v1.05   
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