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Old July 1st 06, 02:36 PM posted to rec.photo.equipment.large-format
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Default morse contact printers

In article t,
Richard Knoppow wrote:

"Thor Lancelot Simon" wrote in message
...
In article
et,
Richard Knoppow wrote:


If its as slow as contact printing paper it should work
like a charm.
The lamps are arranged with separate switches for each
lamp for dodging but the lamps are also arranged with
additional switches that turn them on or off in concentric
rings. The 10x10 printer has 39 low wattage GE UV lamps.


These are rather nice for platinum printing.


I am surprized they are intense enough. Platinum printing
usually requires a very strong source such as a plate burner
or not too strong daylight, similar to printing out paper.
The UV sources in the Morse printer are about 4 watts each.
They were designed for short printing time on paper like
Azo, not for printing out papers. Have you actually used a
Morse printer for Platinum?


I took a printing class with George Tice in the early 1990s, and on
the last day he brought his platinum printing setup in and demonstrated
it. From the description of the arrangement of light sources in the
10x10 Morse I am pretty much certain that that's what he used (his printer
was 10x10 as well). I don't know whether he modified the light source
somehow for more brightness -- were these bulbs available in higher wattages?

The printer was very convenient and certainly nicer than other light
sources for platinum printing that I've used since.

Platinum emulsion is very UV sensitive. Perhaps that makes the
difference.

--
Thor Lancelot Simon

"We cannot usually in social life pursue a single value or a single moral
aim, untroubled by the need to compromise with others." - H.L.A. Hart