Sperry Marine 4914-CA, Operation, Installation And Service Manual

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While systems with the Mod. 10/3 container employ an optical pick off to
provide the follow-up control signal, systems with the Mod. 10/2 and
Mod. 7/2 containers use a resistance bridge circuit, formed by the con-
ducting paths from the contact pins in the container, through the sup-
porting fluid and to the equator contact of the gyrosphere.
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The Mod. 7/2 container and the Mod. 10/2 container (if not refitted for
mercury free operation) use mercury for the resistance bridge circuit.
Only specially trained personnel is allowed to take care with all handling
of mercury and special handling procedures must be maintained.
Always keep to the current issue of the mercury handling procedures of
Sperry Marine Northrop Grumman, stock no. 026150-0000-000.