[AZ-Observing] Re: Baby its cold outside
- From: Howard Anderson <handy13@xxxxxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Mon, 29 Nov 2010 21:45:56 -0700
The dew zapper is essentially, I believe, a commercial version of the
nichrome
wire scheme with the wire embedded in rubber "tape". I have used one
occasionally when
dew forms. (Dew in Arizona? I have encountered it
albeit rarely...) The device accepts 12 volts and draws 25 watts.
So that is about a 2 amp draw... Fairly hefty battery drain... However
the device is extremely effective... I always take it with me...
http://www.telescope.com/control/accessories/dew-control/orion-dc-dew-zappers-for-telescopes
Thanks,
Howard
Richard Harshaw wrote:
>About 10-15 years ago, there was an article in ASTRONOMY (or maybe S&T)
>about how to build one out of nichrome wire, a 9-V battery, and rheostat. I
>don't recall the exact issue, but maybe a search of their sites would find
>it?
>
>
>
>Richard Harshaw
>Cave Creek, Arizona
>Brilliant Sky Observatory
>
>
--
Thanks,
Howard, in Tempe AZ
Http://www.astroshow.com
http://www.AZcendant.com
http://www.ShastaDaylight.com
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