CV5 mercury vapour rectifier (4049D, made by STC).
This valve is designed to be mounted vertically, base downwards. The condensed mercury temperature is the temperature of the coolest part of the bulb. This should be just above the base. Air should be blown at this part of the bulb to keep the condensed mercury temperature within the specified limits.
This file was last modified
10:46:40, Sunday July 24, 2016