Re: speed determination

At 05:58 23/03/2001 +0000, you wrote:

>A flourescent light and a print of concentric circles with different
>sector ratios (black units vs. white units can get you close enough
>to interpolate the 'betweeners'. Remember the ne-2 glow of turntables
>and the "strobe pattern" around the disk?
>
>Hope this helps.
>
>Ballendo
>
>P.S. On one site (wedemyers? or a link from/to?) there's a little
>tach made of a dc motor from radio shack.

Take a look at:

http://www.jeffree.co.uk/Pages/speedmeasurement.html

for some ready-made strobe disks etc..

Regards,
Tony