Re: Gasoline thrown in the campfire and burning 3-D images!

[P3D Alexander Klein <klein@xxxxxxxxxxxxxxxxx>]

P3D Gabriel Jacob <jacob@xxxxxxxxxxxxxx> writes:

> RBT mounts were made white on the side that faces the light so that it can
> reflect the radiant heat. Now why is the other side black? It seems (and
> I am only guessing here) whatever little energy is absorbed from the white
> side can be more efficiently emitted if it is black! Since the temperature
> difference between the white side and black side is greater on the white
> side, the black part will radiate instead of absorb.

Many modern slide-mounts are dark on one side and white on the other. As
Gabriel says, the white side reflects the heat back from the slide. The
dark (mostly black) side faces the projector lenses in order to avoid
reflections between the slide and the glossy surface of the lens, which
would result in a less contrasty picture on the screen (since there would
be light going through the lens to the screen that does not come _diect-
ly_ from the slide, but is a bit scattered.

alex


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