----- Original Message -----
From: "Ian Fleming" <
Subject: Re: Paterson System 4 tank
> Mine does not appear to have an insert,though there are 2 lugs
down
> the hole in the middle where one could possibly attach one.
> I will use the inversion method,Kodak suggest vigorous
agitation,I
> was going for inversion as most books advise,shaking would
produce
> air bubbles,surely not a good idea.I have read Lanfords Basic
> Photography.
My own method for inversion agitation is very gentle. I fill the
tank to nearly the top, so as to limit air space, and an
agitation cycle consistes of turning the tank over and giving a
half twist, then turning it back upright, again with a half
twist. I always twist the same direction. I use 6 agitation
cycles per minute, which is about 10 seconds per minute.
William Robb
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