Re: PHOTO-3D digest 1070

[Ronald J Beck 840196 <rbeck@xxxxxxxxxxxxxxxx>]

>The Chicago Stereo Camera Club projects their annual juried exhibition 
(the
>"Lighthouse Show") using two TDC projectors and a dissolve device 
something
>like what you describe.  As I recall, though, it uses linear, 
"slide-pot"-style
>dimmers, which are driven by rods whose ends ride in a couple of slots in 
a
>circular lucite plate.  The slots are short segments of a spiral, so that 
when
>the operator turns the lucite plate, the rods move in opposite directions.
>(It's kind of hard to describe in words, as you can see).  The device is
>beautifully made, and works like a charm.  Alas, as I recall, the man who
>designed and built it is no longer alive.

Now there's a thought... Most of the "slide-pot" style dimmer switches 
I've seen have a removable knob on them (to get them through the plate).  
Two switches mounted in a double box, one right side up and one upside 
down, could be controlled with one hand and a popsicle stick.  In fact, if 
you set the box sideways, sliding the stick to the left would brighten the 
left projector and dim the right and sliding the stick to the right would 
brighten the right and dim the left.

A small jack could be mounted in each projector (like a mono headphone 
jack) so that if the jack were not plugged in, the lamp would be on full 
and if the jack were plugged in, the lamp would be controlled by the 
switch.  A fairly simple modification really.  

Hope this helps,
Ron


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