phil wrote: > Bruce, what was the diameter or how was the column situated to give those > resolutions. > > > > Phil
The thermoregulator consisted of a horizontal ring tube filled with toluene connected to a 13" long J -tube filled with mercury and containing a capillary section at the top. The top contact consisted of platinum wire within and parallel to the capillary section, the mercury entered the capillary section and made contact with the tip of the vertical platinum wire therein. The other contact was made via a piece of platinum wire sealed through the side of the glass tube below the capillary section. Thus the top contact platinum wire fine enough to fit within the capillary section of the J tube and to a first approximation the diameter has no effect on the sensitivity which is due to the relatively high thermal expansion of the (highly flammable and somewhat toxic) toluene. Platinum and iron have the advantage that they do not directly form amalgams on contact with mercury and are thus not embrittled by amalgamation. However amalgams of platinum and iron can be formed electrochemically. I have a couple of illustrations of such thermoregulators which I can scan if you wish. 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.