A Ringrose Firedamp Alarm.
This Ringrose Firedamp Alarm was made by I.G.D. Ltd the International Gas Detectors Limited of Leeds, England.
Made from metal, glass, iron and copper. Size 9 1/2″ x 3″ x 3″ inches.
Dated to the 1970’s-1980’s?
These metal Ringrose Firedamp Alarms were later produced with a plastic casing and also made slightly larger.