Thanks for the guillotine suggestions, Bob. I think it would be a bit out of my mechanical skills comfort zone at the moment. It might be easier to try and locate a used EG&G in the future, but I'd love to have a solution sooner.
Originally Posted by laser
The purpose of the device is for re-testing 320TXP to establish my N, N-1, N+1 development times, at this stage, and perhaps to evaluate speed too. I describe my issues, including my flawed attempt at deriving CIs, on this thread. Longer-term, I would like to use this set-up to continue testing other materials, but all would be fairly standard B&W film.