Additives to control mercury in combustion gases

REMOTE CONTROLS FOR MARINE ENGINES

CONTROLLING DEVICES, EMPLOYING ELECTRIC CIRCUIT CONTROLLING SWITCHES; NAMELY, [ VACUUM OPERATED ELECTRIC SWITCHES, ] PRESSURE OPERATED ELECTRIC SWITCHES [ , FLOAT OPERATED ELECTRIC SWITCHES, MECHANICALLY OPERATED ELECTRIC SWITCHES AND MAGNETICALLY OPERATED ELECTRIC SWITCHES, AND PARTS THEREOF INCLUDING MERCURY SWITCHES ]