Accident Rate
Ironically, the introduction of the Davy lamp led to an increase in mine accidents, as the lamp encouraged the working of mines and parts of mines that had previously been closed for safety reasons.
Men continued to work in conditions which were unsafe due to the presence of methane gas. Although extractor ventilation fans should have been installed to reduce the concentration of methane in the air, this would have been expensive for mine owners, and thus such fans were not installed. A legal requirement for minimum air-quality standards eventually led to the introduction of more ventilation. The lamps also had to be provided by the miners themselves, not the owners, as traditionally the miners bought their own candles from the company store.
Another reason for the increase in accidents was the unreliability of the lamps themselves. The bare gauze was easily damaged, and once just a single wire broke or rusted away, the lamp became unsafe. Even when new and clean, illumination from the safety lamps was very poor, and the problem was not fully resolved until electric lamps became widely available in the late 19th century.
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