[Milsurplus] Arc Lamps for projector sets

[Raymond Cote]

Yes they wee Peerless and the housing was made or called Peerless Magnarc.  As stated, run off a motor generator.  

> Date: Mon, 30 Apr 2012 12:02:01 -0700
> From: jfor at quikus.com
> To: sdaitch at kuw.ibb.gov
> CC: milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] Arc Lamps for projector sets
> 
> On the topic of carbon arc lamps, I believe it is easier to make an arc
> lamp to run on DC than AC.
> 
> The DC electrodes are different, positive and negatice. The AC electrodes
> are the same for both.
> 
> I think movie projectors use DC to avoid strobing effects, because the
> projector has a shutter that is closed while the film advances. In the US
> that is 24 per second, and has common factors w/ 60 Hz.
> 
> Even using filtered DC there is some strobing and the projector has a
> mechanical differential to adjust the shutter phase.
> 
> -John
> 
> ====-
> 
> 
> 
> > Way back, when I was still in high school, I worked in
> > a theater which used carbon arc lamps but we had
> > a motor generator which provided the DC for the arc lamps.
> >
> > I am almost positive the lamps were made by Peerless and
> > very similar to:
> >
> > http://www.flickr.com/photos/combatcamera44/6103931423/in/photostream/
> >
> > 73
> > Sheldon
> >
> > On 4/30/2012 5:57 PM, Richard Solomon wrote:
> >> Most of the Movie Theatres in Downtown Boston used DC for the Arc Supply
> >> on
> >> their projectors. Copper coated Carbon rods were used.
> >>
> >> BTW, anyone remember the War Surplus store next to the old Radio Shack
> >> on
> >> Washington Street ? Just outside Scollay Square.
> >>
> >> 73, Dick, W1KSZ
> >>
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> 
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