The murmur of the snarkmatrix…

August § The Common Test / 2016-02-16 21:04:46
Robin § Unforgotten / 2016-01-08 21:19:16
MsFitNZ § Towards A Theory of Secondary Literacy / 2015-11-03 21:23:21
Jon Schultz § Bless the toolmakers / 2015-05-04 18:39:56
Jon Schultz § Bless the toolmakers / 2015-05-04 16:32:50
Matt § A leaky rocketship / 2014-11-05 01:49:12
Greg Linch § A leaky rocketship / 2014-11-04 18:05:52
Robin § A leaky rocketship / 2014-11-04 05:11:02
P. Renaud § A leaky rocketship / 2014-11-04 04:13:09
Jay H § Matching cuts / 2014-10-02 02:41:13

Because Really, Who Has a Toothed Wheel These Days?

Back in the day, you needed some pretty serious gear to measure the speed of light:

[Fizeau] shone a light between the teeth of a rapidly rotating toothed wheel. A mirror reflected the beam back between the same gap between the teeth of the wheel.

There were over a hundred teeth in the wheel. The wheel rotated at hundreds of times a second — therefore thousandths of a second was easy to measure. Light was reflected from mirrors more than 5 miles apart. This also helped him making accurate measurements.

(That’s from, your one-stop shop for speed-of-light related inquiries.)

Nowadays it’s much easier: All you need is a microwave.

(Link via Boing Boing.)

May 5, 2004 / Uncategorized

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