John, I in turn feel like a fool explaining anything to you, sort of like explaining something to Ansel! Picker maintained that even with lamp warmers and timers, the amount of light being emitted from the enlarger was not exact, I.e. a few milliseconds of turn on might be lost due to lamp warm-up or turn on. If this was true, 5 3-second exposures would be slightly different from a single 15-second exposure. So he eliminated a possible variable by replicating the test strip procedure, and those (possible) milliseconds are what he called intermittency effects.
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