<P> The Chrysler Building is renowned for, and recognized by, its terraced crown, which is an extension of the main tower . Composed of seven radiating terraced arches, Van Alen's design of the crown is a cruciform groin vault of seven concentric members with transitioning setbacks, mounted one behind another . The entire crown is clad with Nirosta steel, ribbed and riveted in a radiating sunburst pattern with many triangular vaulted windows, transitioning into smaller segments of the seven narrow setbacks of the terraced crown . Due to the curved shape of the dome, the Nirosta sheets had to be measured on site, so most of the work was carried out in workshops on the building's 67th and 75th floors . </P> <P> According to Robinson, "Its' dormers', each smaller and higher than the previous one, continue the wedding - cake layering of the building itself . This concept is carried forward from the 61st floor, whose eagle gargoyles echo the treatment of the 31st, to the spire, which extends the concept of' higher and narrower' forward to infinite height and infinitesimal width . This unique treatment emphasizes the building's height, giving it an other worldly atmosphere reminiscent of the fantastic architecture of Coney Island or the Far East ." </P> <P> Above the 71st floor, the stories of the building are designed mostly for exterior appearance, functioning mainly as landings for the stairway to the spire and do not contain office space . They are very narrow, have low and sloping roofs, and are only used to house radio transmitters and other mechanical and electrical equipment . For example, the 73rd floor houses the motors of the elevators and a 15,000 - US - gallon (57,000 L) water tank, of which 3,500 US gallons (13,000 L) are reserved for extinguishing fires . </P> <P> Television station WCBS - TV (Channel 2) originated its transmission from the top of the Chrysler Building in 1938 . WCBS - TV transmissions were shifted to the Empire State Building in 1960 in response to competition from RCA's transmitter on that building . For many years WPAT - FM and WTFM (now WKTU) also transmitted from the Chrysler Building, but their move to the Empire State Building by the 1970s ended commercial broadcasting from the structure . </P>

What is in the top of the chrysler building
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