Quote:
Originally Posted by Photo Engineer  Patrick;
We originally used an analog computer such as you describe at Kodak. And, the operator's name was James Kirk. (His middle initial was not "T"). In any event, hypo can bleach the silver image so it can be made to vanish during fixation.
My point being though that every capacitor has its own characteristics and you agree from what I read. This is also true of films and developers, and the variety and number of results from combinations can be staggering.
PE |
Exactly so. All the more reason to attempt to minimize the number of experiments needed to define a characteristic curve. When I saw that all these films plotted as straight lines as log(Gmax - G) vs time and that Gmax for a given film-developer was independent of temperature, it became apparent that 2 experimental determinations of gradient G at one temperature and one determination at another temperature would define all the data provided by Kodak for 1 film. In other words, 3 experiments provided all the information that was contained in 15 by Kodak, and more besides because the effects of times and temperatures not tested can be estimated with good accuracy from the same 3 experiments.
You understand, of course, that random experimental errors can and do occur. It is always best to have more data than the minimum that would be required if there were no experimental error. My preference is to make the 2test times as different as practical and to repeat tests at those times for averaging out errors. Obviously, making one time twice the other would eliminate the use of successive approximation to solve for Gmax.