The National Cathedral, also known as Washington Cathedral and officially named the Cathedral Church of St. Peter and St. Paul, has been under construction for more than 80 years. But that's not so surprising, considering the construction techniques and strict quality control measures enforced by the cathedral's architects and clerk of the works. IN THE BEGINNING In 1907, the cathedral's Building Committee still hadn't decided what material to use. Then, the committee researched limestone. The committee chose Indiana limestone because it met their requirements: large amounts of the stone, uniform in texture and color, were available. ON THE JOBSITE TODAY Today, three stonemasons, a bricklayer, a mortar mixer, a carpenter, a crane operator, a scaffold builder, and 8 laborers make up the cathedral's construction crew. The basic stone setting crew and the hand tools that they use--trowels, wooden mallets with rawhide faces--have not changed much through the generations.