MERCOID

LIMITING, SIGNALLING AND SAFETY DEVICES-NAMELY, [ LIGHT ACTUATED FLAME DETECTORS AND ] MERCURY CONTACT DEVICES, TEMPERATURE ACTUATED FLAME DETECTORS, BAROMETRICALLY OPERATED DEVICES, THERMOCOUPLE OPERATED DEVICES, TIMING DEVICES, DIFFERENTIAL PRESSURE AND TEMPERATURE DEVICES, VACUUM ACTUATED CONTROLLING AND INDICATING DEVICES, AND FLOAT ACTUATED CONTROLLING AND INDICATING DEVICES