The tower has eight floors, exclusive of the entrance; there are two oilrooms, one above the other, holding 4,300 gallons of oil, above which is a coal and store room, followed by a second storeroom. Outside the tower at this level is a crane, by which supplies are hoisted, and which also facilitates the landing and embarkation of the keepers, who are swung through the air in a stirrup attached to the crane rope. Then in turn come the living-room, the “low-light” room, bedroom, service-room, and finally the lantern. For the erection of the tower, 2,171 blocks of granite, which were previously fitted temporarily in their respective positions on shore, and none of which weighed less than 2 tons, were used. When the work was commenced, the engineer estimated that the task would occupy five years, but on May 18, 1882, the lamp was lighted by the Duke of Edinburgh, the Master of Trinity House at the time, the enterprise having occupied only four years. Some idea may thus be obtained of the energy with which the labour was pressed forward, once the most trying sections were overcome. Whereas the former lights on this rock had been of the fixed type, a distinctive double flash was now introduced. The optical apparatus is of the biform dioptric type, emitting a beam of some 300,000 candle-power intensity, which is visible for seventeen miles. In addition to this measure of warning, two powerful Argand burners, with reflectors, were set up in the low-light room for the purpose of throwing a fixed ray from a point 40 feet below the main flashing beam, to mark a dangerous reef lying 3½ miles to the north-west, known as Hand Deeps. When the new tower was completed and brought into service, the Smeaton building was demolished. This task was carried out with extreme care, inasmuch as the citizens of Plymouth had requested that the historic Eddystone structure might be re-erected on Plymouth Hoe, on the spot occupied by the existing Trinity House landmark. The authorities agreed to this proposal, and the ownership of the Smeaton tower was forthwith transferred to the people of Plymouth. But demolition was carried out only to the level of Smeaton’s lower storeroom. The staircase, well and entrance were filled up with masonry, the top was bevelled off, and in the centre of the stump an iron pole was planted. While the Plymouth Hoe relic is but one half of the tower, its re-erection was completed faithfully, and, moreover, carries the original candelabra which the famous engineer devised.