Another tedious operation was the fitting up of the interior of the Tower with wainscot lining and forming the various stories into apartments separate from the staircase. Much work was also expended in providing the fire-places with proper flues, in fitting up water tanks, coal stores, and oil tanks, and also in conveying the air-tubes between the Lightroom and the several apartments by which the signal bells are rung for summoning the keepers to mount guard. The keeper on duty is, by the rules of the Service, forbidden, under penalty of instant dismissal, to leave the Light-room, on any pretext, until relieved by the next who mounts guard, and who is summoned by means of a bell placed inside his cot or sleeping berth, which is rung by means of a small piston, propelled by simply blowing into a mouth-piece in the Light-room. The keeper in bed answers this signal by a “_counter-blast_,” which rings another bell in the Light-room, and informs the keeper there that his signal has been heard and will be obeyed. ~Arrangement of the several apartments.~ The general arrangement of the Tower, may be seen in the Section Plate VIII.; and the details of its subdivision are very similar to those shewn in Plate XVI. of my Father’s Account of the Bell Rock Lighthouse. The ascent to the outside door is by a ladder or trap of gun metal, 26 feet high. The first apartment on the level of the entrance door, is chiefly appropriated to the reception of iron water-tanks, capable of holding a supply of 1251 gallons. The next story is set aside for coals, which are stowed in large iron boxes. The third apartment is a workshop; the fourth is the provision store; and the fifth is the kitchen. Above are two stories, each divided into two sleeping apartments, for the four Light-keepers. Over them is the room for the Visiting Officers; then follows the oil store, and lastly comes the Lightroom, making in all twelve apartments. The nearness of the oil store to the Lightroom is a great convenience to the Keepers, who are thus saved the trouble of carrying the daily supply of oil to the Lightroom, up a long flight of steps. The passage from story to story is by oaken trap ladders, passing through hatches in each floor and partitioned off from each apartment in order to prevent accidents and to check cold draughts. ~Lightroom Apparatus, and first exhibition of the Light.~