Date: Wed, 3 Dec 2003 14:57:12 -0800

Author: Paul Doherty

Subject: Re: seeing colors

Post:

The Exploratorium Exhibit "color Reversal" shows this effect.

CookBook #1 Recipe 29

Flash the red light for 35 ms then the white light for 70 ms

We use a 40 degree angle opening followed by 80 degrees of angle for the
white. The motor turns at 300 RPM.

We use Kodak wratten filter red #25.

The explanation begins " To date there is no definite or complete
explanation for this effect."

Paul D

From urs.lauterburg@phim.unibe.ch Wed Dec 3 18:14:53 2003
Date: Thu, 04 Dec 2003 00:12:55 +0100
From: Urs Lauterburg
Subject: Re: Simple CAD wanted - Mac
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Well,

I think I am pretty productive on Macs not much fozing, patching, plowing
trough hundreds of popping wizard windows. I don't think this makes me a
guru though, maybe more the contrary.

Anyway I think Steve found the best already:

CADintosh is a very nice and small though 2D only drawing program from the
author who makes the wonderful GraphicConverter, a program which converts
literally all image formats into any other one from whatever platform it
may come from or go to.

check out:

http://www.lemkesoft.com/en/cadintosh.htm

DesignWorks from Capilano is not CAD but a very nice and inexpensive piece
of software for electronics circuit design. I use the professional version
to make schematics which can be processed through netlists for electronic
circuit board production.

http://www.capilano.com/

DesignWorks links to Douglas CAD/CAM Professional for the circuit boards:

http://www.douglas.com/

These are good tools and compared to ORCAD-PCB or PROTEL with a high
quality/low budget ratio.


Urs


>Found this
>http://www.versiontracker.com/dyn/moreinfo/macosx/1216
>but
>urs is the mac guru
>
>_________________________________________________________________
>Browse styles for all ages, from the latest looks to cozy weekend wear at
>MSN Shopping. And check out the beauty products! http://shopping.msn.com


From rtmq@stn.net Thu Dec 4 07:30:28 2003
From: "Robert T McQuaid"
To: tap-l@listproc.appstate.edu
Date: Thu, 4 Dec 2003 12:30:42 -0000
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Subject: Day length at equinox
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December 4, 2003

Tappers
tap-l@listproc.appstate.edu

Subject: Day length at equinox

Two months ago there was a discussion on the subject of
the length of the day at the equinox. The questioner
was puzzled that on the day of the equinox, there was
more than 12 hours between sunrise and sunset.

I could not find the reference at the time, but it is at
http://aa.usno.navy.mil/faq/docs/RST_defs.html

Sunrise and sunset are defined as the point at which the
upper edge of the sun crosses the horizon, not the
center. And there is a further adjustment because of
refraction by the earth's atmosphere. This enables the
sun to be viewed even when it is still slightly below
the geometric horizon. So sunrise and sunset are
calculated at the time the center of the sun is 50 arc
minutes below the geometric horizon.

Robert T McQuaid
Orangeville Ontario Canada
Amateur astronomer

From seniort@newtrier.k12.il.us Thu Dec 4 10:02:42 2003

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