Davy lamp : See Safety lamp, under Lamp.

Example:


Taxonomy
Davy lamp, lamp, flame, firedamp, safety lamp, Geordie lamp, gauze, mesh, free encyclopedia, presence, miners, coal mines, Davy, Accident rate, vegetable oil, concentration, flame safety, torch.

Defination from the web:
lamp could become unsafe if the internal glass was broken (as it became an oversize Davy) ... The introduction of the Davy lamp actually led to an increase in accidents in mines, as the lamp encouraged working mines that had previously ...