Extract from Instructions to the Professional Officers of His Majesty’s Dockyards: “When gangs or companies are working by candlelight, such candles only as are necessary are to be demanded, and when so working on board a ship, the Officer in charge of the work is to take care that no candle is used without a candlestick of the established Admiralty pattern, with a distinguishing number stamped thereon, so that the person using it may be traced”.