<P> The monument is filled with ironwork, consisting of its stairs, elevator columns and associated tie beams, none of which supports the weight of the stonework . It was redesigned in 1958 to reduce congestion and improve the flow of visitors . Originally, visitors entered and exited the west side of the elevator on the observation floor, causing congestion . So the large landing at the 490 - foot level was expanded to a full floor and the original spiral stair in the northeast corner between the 490 - and 500 - foot levels was replaced by two spiral stairs in the northeast and southeast corners . Now visitors exit the elevator on the observation floor, then walk down either spiral stair before reboarding the elevator for their trip back down . </P> <P> The main stairs spiral up the interior walls from the entry lobby floor to the elevator reboarding floor at the 490 - foot level . The elevator occupies the center of the shaft well from the entry lobby to the observation floor, with an elevator machine room (installed 1925--26) whose floor is 18 feet 10 inches (5.7 m) above the observation floor and an elevator pit (excavated 1879) whose floor is 9 feet (2.74 m) below the entry lobby floor . The stairs and elevator are supported by four wrought iron columns each . The four supporting the stairs extend from the entry lobby floor to the observation floor and were set at the corners of a 15 - foot - 8 - inch (4.78 m) square . The four supporting the elevator extend from the floor of the elevator pit to 14 feet (4.3 m) above the observation floor and were set at the corners of a 9 - foot - 9 ⁄ - inch (2.98 m) square . The weight of the ironwork is 275 long tons (308 short tons; 279 tonnes). Cast iron, wrought iron, and steel were all used . The two small spiral stairs installed in 1958 are aluminum . </P> <P> Most landings occupy the entire east and west interior walls every 10 feet from and including the east landing at the 30 - foot level up to the west landing at the 480 - foot level, east then west alternately . Three stairs with small landings rise from the entry lobby floor to the 30 - foot level successively along the north, west and south interior walls . Landings from the 30 - foot level up to the 150 - foot level are 3 feet 2 ⁄ inches (0.97 m) by 25 feet 1 inch (7.65 m), while landings from the 160 - foot level to the 480 - foot level are 7 feet 10 ⁄ inches (2.41 m) by 31 feet 5 ⁄ inches (9.59 m). All stairs are on the north and south walls except for the aforementioned west stair between the 10 - and 20 - foot levels, and the two spiral stairs . </P> <P> About one fourth of visitors chose to ascend the monument using the stairs when they were available . They were closed to up traffic in 1971, and then closed to all traffic except by special arrangement in 1976 . The stairs had 898 steps until 1958, consisting of 18 risers in each of the 49 main stairs plus 16 risers in the spiral stair . Since 1958 the stairs have had 897 risers if only one spiral stair is counted because both spiral stairs now have 15 risers each . These figures do not include two additional steps in the entry passage that were covered up in 1975 by a ramp and its inward horizontal extension to meet the higher (since 1886) entry lobby floor . One step was 3.2 feet (1 m) away from the outer walls and the other was at the end of the passage, 15 feet (4.6 m) away from the outer walls . </P>

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