March 23, 2008
WWII submarine barometer-manometer
WWII submarine barometer-manometer. These ranged up to 37 inches of mercury, mainly because BEFORE a dive, the interior of the sub was slightly pressurized, to ensure that valves, hatches, and of course any bullet holes were sealed off. A leak in a diving Submarine could be fatal.These were mounted prominently BETWEEN the two"PLANESMANS" stations, as these crewmembers could cancel a dive if this instrument did not show a pressure build up in the hull.