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found most advantageous, to employ asteady person to take charge of the lamps,and who is made responsible for keepingthem in good order. A chamber is allottedto him, in which he keeps a number of sparelamps, together with oil and cotton for re-plenishing the lamps which are in use.

The brass collar of the wire gauze cy-linders are secured to the bottoms of thelamps by locks, which can only be openedby the lamp keeper, so that the workmencannot either by accident or carelessnessexpose themselves to danger by separatingthe wire gauze cylinders from the bottomsof the lamps.

After finishing their day’s work, the col-liers bring their Davys to the lamp-keeper’scabin , who unlocking them, takes the bot-toms into his own possession and allows thecolliers to take the wire gauze cylindershome for the purpose of cleaning them tho-roughly.

When the colliers return to their workthe following morning, the lamp keeperhaving replenished the lamps with oil andcotton, lights them and screws on their tops,and then examines them with the utmost