9 Mar
2007
9 Mar
'07
9:18 p.m.
OK Chuck.
We can take a look at the Scientific American Ameteur Scientist.
Its online somewhere, or I'll look up the article for those iterested.
L.C. Stong did an article on an XY swinging pendulum, adjustable XY rates.
knife edges and a funnel filled with a pencil thin stream of sand to drop
onto black paper.
Hows that for old as dirt?
Cheers,
Randy
From: "Chuck Guzis" <cclist at
sydex.com>
Reply-To: "General Discussion: On-Topic and Off-Topic
Posts"<cctalk at classiccmp.org>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Subject: Re: raster laser?
Date: Fri, 09 Mar 2007 13:50:05 -0800
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Randy Dawson wrote:
Popular Electronics had a lissajous figure generator project to attach
to a scope in XY mode. Just a couple of slowly frequency and amplitude
ramping sine wave oscillators. I always wanted to drive some XY servo
mirrors and put that on the wall for a laser light show.
Doesn't Helmholtz show a rig like this in his "On the Sensations of
Tone" (circa 1863)? No lasers (not even incandescent light), but a
mechanical mirror-equipped rig to look at Lissajous figures.
Oscillographs are much older than electronics.
Cheers,
Chuck