phil wrote: > Russ > Do you have a photo, would it be possible to build? I have a few flasks of > mercury and a few 10's of thousands of mercury wetted relays that some could > be cannibalized for electrodes. The trick here is how thin is that column of > mercury. My guess the thinner the column, the finer the resolution or the > more it will travel with a small temp swing. Better yet, possible to cut > that thing open and fix it. > I know that's more time than it's worth. > > Another thought, if the contacts have corroded in the mercury, perhaps from > contamination, would it be possible to "burn" the contamination off. > Thinking of excessive voltage/current. Perhaps making it arc internally. > Trick would be to limit current not to explode the thing, perhaps using a > charged capacitor. Just a thought. > > Oh, do you have the whole rack, all dividers and the clock? I bet the old > clock alone is worth a thousand bucks today. Seems like it was driven by 1 > KC. My old standard was complete, a 5 or 6 foot rack and came out of an old > Hamerland Radio plant. > > phil > > > Phil
NBS used platinum wires in their mercury toluene thermoregulators. These were constructed from pyrex as it proved more stable than stainless steel. These themoregulators had a sensitivity of about 0.001C and were used to regulate the temperature of oil baths, Bruce _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.