years), maintaining the fine craft tradition of the bridge keepers for centuries (Figure 4). Shogun's Bridge (1638), crossing the Daiya-gawa River in the sacred City of Nikko, is the oldest known cantilever. The bridge was badly damaged in the typhoon of 1902, rebuilt, and exists today bearing foot traffic. It consists of hewn stone piers pierced with rectangular holes that permit the insertion of tightly fitting cut-stone struts, two anchor spans, timber beams jutting out in cantilever form, and a suspended span. Figure 3 Bridge of Khaju (1667), Isfahan (Iran), Figure 4 Kintaiko (1673), Iwakuni (Japan), with its five combining architecture and engineering in splendid wooden arches intricately wedged, slotted, and harmony, functioned as a bridge, dam, and a resort for dovetailed, has been faithfully rebuilt for centuries. Each
ever erected to that science—was the third largest building in the Washington area (after the Pentagon and the new State Department headquarters), and although its 1,400,000 square feet exceeded the C.I.A.'s 1,135,000, it proved too small after only five years. In May of 1963 the J. W. Bateson Co., Inc., was awarded a contract for $10,940,000 to construct a nine-story Operations Building Annex of boxy, modern style between the jutting arms of the square A. It added 500,000 square feet to the N.S.A. headquarters complex, 140,000 of it in a basement area almost certain to be used for computers. The annex was completed in late 1965. This expansion was clearly made necessary by the rapid growth of the agency. In 1956, the director told a Senate committee, "We have almost 9,000 civilian employees here in the Washington area and around the world." In 1960, two former employees reported that 10,000 persons
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