The term 'Raiser of Alarm in a Coal Mine' refers to the use of a CANARY in coal mining. Canaries were used in coal mines as an early warning system for dangerous gases such as carbon monoxide and methane. The birds were more sensitive to these gases than humans, so if the CANARY died or became ill, miners knew to evacuate the mine immediately. This practice was common until the late 20th century when electronic gas detectors replaced the use of canaries.