Where large quantities of fire-damp are present, safety-lamps of approved pattern must be used and carefully inspected daily.
Where the gases are fiery, the use of protected lights or safety lamps (q.v.) becomes a necessity.
Two further papers read in January 1816 explained the employment of wire gauze instead of narrow tubes, and later in the year the safety lamps were brought into use in the mines.
colliers boys sitting on the ground holding their safety lamps.
For lighting only approved safety lamps should be used, and blasting operations should be performed with " Permitted " explosives only.