For batteries, a solution is to develop an electrode material that instead expands as the mercury drops, boosting performance in frigid temperatures. That's what led the team from multiple ...
Volková, V., Czechoslov. Hungar. Polarograph. Conference, Prague (July 1958). Volková, V., Second International Polarographic Congress, Cambridge (August 1959).
The bulb is 6¼ in. long. It contains two separated tungsten electrodes, a little pool of mercury, a tungsten filament. When the electric switch is turned, current heats the filament to incandescence.