[Milsurplus] Arc Lamps for projector sets

[J. Forster]

Mercury vapor rectifiers or, more likely, Tungar bulbs likely.

Ignitrons are very unlikely as they and Thyratrons are phase controlled
rectifiers.

-John

==============



> Yes, Simplex Projectors.
> Had big square film containers.
> Color was Blue.
> My High School days in mountainous KY.
> Two coated carbon rods at the primary
> focus point.  Adjusted from outside via
> a little crank and a current meter.
> Later versions had an automatic adjust
> mechanism.  Positive rod burnt faster.
> All I ever saw was DC.  Ignatrons (?).
> Tnx fer the memory.
> 73  Clete
> ++++++++++++++++++++++++++++++++
>
>
> On 4/30/2012 11:09 AM, Sheldon Daitch wrote:
>> 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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