What is the primary purpose of individual electric lamps carried by all persons underground?

The primary purpose of individual electric lamps carried by all persons underground is illumination. Underground environments are typically dark and can be hazardous due to limited visibility. Personal electric lamps help miners see their surroundings clearly, which is essential for safe navigation and operation in such conditions.

Illumination provided by these lamps allows workers to perform their tasks effectively and reduces the risk of accidents caused by tripping, falling, or running into equipment. The ability to see well in dark areas is critical for identifying potential hazards, ensuring safe practices, and enhancing overall productivity.

While signaling other workers, providing power to tools, and emergency backup lighting are important aspects in mining operations, they are not the primary purpose of individual electric lamps. Their main function is to ensure that each worker has adequate lighting to carry out their duties safely and efficiently.