[pure-silver] Re: Elwood 5x7?

On Thursday 21 July 2005 21:19, Richard Knoppow wrote:

>
>    Again, I recommend downloading the patent. The lamphouse

  Hi,
        I've tried but it seems some problem between the tiff format used and 
my tiff 
viewer exists. I'll try it again this weekend.

> came with a sheet of graduated ground glass, dense in the
> center and tapering to nearly clear at the edges. According
> to the catalogue it wa made by snand blasting. In addition
> to this there should be one or more sheets of plain ground
> glass. Some enlargers had as many as five sheets of plain
> ground glass to get the illumination uniform. Late enlargers
> also have a sheet of heat absorbing glass.

  From reading the manual I'm guessing the glass might be for heat. I can't 
believe they fit seven layers of full size glass in the spot the manual 
claims it should go.  OTOH I'm having problem visualizing how to rig up all 
these little pieces of glass. Maybe the metal fits into the groove.


>    Plain ground glass is available from several sources but
> the graduated glass is hard to find. I suppose one could
> make a a sheet by selective grinding using a fairly coarse
> grit. The other choice is to replace the lamphouse with an
> Arista cold light head, but that is expensive.

   I was thinking using layers of Roscoe diffusing gel. Worse case I think 
making my own fluorescent head would be the way to go.

> that slide in and out. Beginning at some fairly early time a
> built in red filter was included. This is loacated in the
> front standard just above the lens and is operated by a
> small lever sticking out the side.

  The box includes two or three red filters. Not a big worry. I've never used 
one before.



Nick
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