HOW NELSON-FARRAR INDEXES HAVE CHANGED

Gerald L. Farrar Contributing Editor The accompanying table shows how Nelson-Farrar indexes have changed over the period, 1987-1990, for selected basically nonmetallic building materials. Data are included for the overall nonmetallic group, five nonmetallic materials, and iron castings. Fireclay brick and iron castings indexes showed the greatest changes during the period. Fireclay brick changed from 930.4 in the first quarter of 1987 to 1039.5 in the fourth quarter of 1990. During the same

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