The National Capitol of Cuba was built between 1926 and 1929, with very short completion terms for the technical-construction means of that time. The historic-technological article describes its dome's bearing structure and it analyzes the constructive method used in the central part of this urban symbol. The analysis begins from a very rigorous study of the original plans, on-site visits made at the beginning of its rehabilitation, historic photographs belonging to the Ministry of Public Works and the revision of the published texts and photographs in The Capitol Book, of which there are only two physical copies in the premises of the Havana City Historian's Office and in the Cuban Ministry of Culture.(1) The article makes known the technical and constructive outstanding points, used at that time for the implementation of the dome and it unmasks its internal structure, which is extremely complicated. The text is accompanied by several axonometries that facilitate its graphical understanding.
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