Strobe Lights.

You need to adjust the strobe light

Yes, you can hold a strobe disk up to your eye. This is a painted-black disk with one slot, spun (often by hand) so as to block a peephole. Instead of turning the light on/off, you block your line of sight to the fan except during the slit-crosses-the-peephole instants.

It doesn't have to be your eye, of course, you can put a camera behind the peephole and observe the photograph in any lighting you find desirable...

Maybe, maybe NOT. The 'white' LEDs use blue or UV emitters and phosphors, so part or all of the light output is delayed. A gas-discharge lamp (like xenon or even neon) has better timing control. It also tolerates high-brightness/low duty cycle better than a semiconductor.

A few days ago, I looked on the web for, LED Strobe Lights

I might buy one just to play with.I think it would be cool if the auto companies could/would figure out a way to ''strobe'' the wheels on those cars. cuhulin

On 2/16/2009 4:37 PM snipped-for-privacy@webtv.net spake thus:

Oh, they can strobe all kinds of crap.

Here in the Bay Area, there's a particularly annoying application of strobes in the BART (Bay Area Rapid Transit) subway in San Francisco. If you look out the window between two of the stations on one side*, you can see faint but visible moving images, kind of like an old-time kinescope, with advertising themes. The pictures are placed on the wall in a strip, and the strobe is apparently on the train and synched to the train's speed past the pictures.

Some frigging genius has figured out how to turn even idly looking out the window into yet another way of getting our money.

• Between Embarcadero and Montgomery, southbound, looking out the south side of the train.

I have been to San Francisco twice before.January 1964 on my way to Vietnam.About a year later, back to the Land of the Round Eyes and the Big PX.

Strobin, man, strobin. cuhulin

On 2/16/2009 6:53 PM snipped-for-privacy@webtv.net spake thus:

I have no idea what you're talking about.

-- Personally, I like Vista, but I probably won't use it. I like it because it generates considerable business for me in consulting and upgrades. As long as there is hardware and software out there that doesn't work, I stay in business. Incidentally, my company motto is "If this stuff worked, you wouldn't need me".

- lifted from sci.electronics.repair

Don't worry, you're not alone there.

He's a troll. Do you expect him to make sense?

I don't know if he is a troll or just a bit strange. I know people in real life like this. Half of what they say makes perfect sense, but then they go off on some wild tangent. You walk away wonering what just happened.. Whatever the case, half the time he asks somewhat valid questions. The other time I don't know what he is talking about.

Look at his posting history on the rec.radio.shortwave group. There is no doubt that he is a troll.

I'll take you word for it, I know your pretty sensible. I remember back the first time I saw his posts I thought he had some valid questions, but thats been quite a long while ago and I've had no usenet acess for the last 6 months, so I've got no idea what kind of crazy stuff he's been saying.

He was bragging on the shortwave group about stealing things from Goodwill stores by switching the price tags from something cheaper, and having sex with his dog.