What duties are critical for lighthouse keepers' daily routine?

The daily routine of lighthouse keepers involves several critical duties. They cleanse and prepare the apparatus for nocturnal illumination^[1]. Also, they must mount guard alternately after the light is exhibited^[1]. The most important part of lighthouse keeper's duty is to 'light the lamps every evening at sun-set-ting, and keep them constantly burning, bright and clear, till sun-rising'^[1].

Lighthouse keepers are instructed to acquire a thorough knowledge of the equipment used such as lamps, oil, wicks, lighting apparatus, and revolving machinery^[1]. Cleanliness is extremely important, and all parts of the apparatus must be carefully freed from dust^[1]. Two keepers are to be on duty, and there must be no excuse for disobeying this regulation^[1].