[Physltest] [Phys-L] Re: Looking for a Mars Clock?

[Scott Goelzer <s.goelzer@COMCAST.NET>]

Since you seem to be looking for very cheap (I understand) perhaps you
can modify a prank we played on a student.

My buddy had a student after for detention. The kid asked if he could
go and my buddy looked at the clock and said yes. It was later
discovered that the kid had set the clock forward. This kind of
challenge cannot be ignored. The detention was rescheduled, but we
hooked the wall clock up to a lab frequency generator and fiddled until
the rate was about two to one (parents were informed). The half hour
detention scheduled was upped to one hour - which actually took two
hours of clock time.

If you have a freq. generator doing nothing,  you could fake a mars
clock.


Scott



**********************************
Scott Goelzer
Physics Teacher
Coe-Brown Northwood Academy
Northwood NH 03261
603-942-5531e218
sgoelzer@coebrownacademy.com
**********************************

On Jan 13, 2005, at 3:20 PM, Bernard Cleyet wrote:

> "I am looking for a wall hung Mars clock.  The only one I can find on
> the internet is $125 and I can't swing that right now.  Does anyone
> know of a source that won't cost quite as much?
>
> Cliff Parker"
>
> If one values their time at say $30/ h as I do, I suspect Brian's $125
> is a steal.  A very rough estimate is ~ $30 parts, plus one hour
> ordering / driving and purchasing from the local spares store, and a
> few hours wiring on a bread board.  The result is not a professional
> in appearance (and actually) wall clock.  Of course, if one is
> interested in the experience, that's something else.
>
> If there were a demand even 1% of that of earth clocks, Brian could
> not compete even if he had to hire a bunch of workers and sold several
> a day.  I estimate in such a case he could sell them at ~ < $50, but a
> company out shoring to China would sell for, say $25?
>
> bc, very amateur micro-economist.
>
> p.s. I googled mars clock to find the price of Brian's clock (I knew
> he'd made one for NASA or an observatory) and assumed that's how Cliff
> found it.
>
> p.p.s reminds me of a David Dorfan * statement.  (paraphrase) Rarely
> will an analog design work w/o tinkering; usually a digital works
> first time.
>
> * Spice expert and teaches analog electronics, inter alia, at UCSC.
>
>
>
> Edmiston, Mike wrote:
>
> > By typing "Mars Clock" into Google, I came up with over 600 hits, one
> > of
> > which has plans for a digital Mars Clock.  Here is the URL
> >
> > http://www.marsbase.net/m/mars-clock.php
> >
> > It's not something anyone can do, but anyone who dabbles with digital
> > circuitry could do it.
> >
> >
> > Michael D. Edmiston, Ph.D.
> > Professor of Chemistry and Physics
> > Bluffton University
> > Bluffton, OH 45817
> > (419)-358-3270
> > edmiston@bluffton.edu
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