. Tests of eighteen concrete columns reinforced with cast ade in order to determine the effect of filling thecast iron with concrete, and columns 5 and 6 to determine theeffect of the variation of the radius of gyration of the cast iron. Columns 7 and 8 were reinforced concrete columns of the ordi-nary type, common in contemporary building were 10 feet long, having a No. 8 wire spiral, two %-inohcircular spacing rods, and four ^-inch square rods as reinforcement. Columns 9 and 10 were representative specimens of the cast-iron tubes as used for reinforcement in columns
. Tests of eighteen concrete columns reinforced with cast ade in order to determine the effect of filling thecast iron with concrete, and columns 5 and 6 to determine theeffect of the variation of the radius of gyration of the cast iron. Columns 7 and 8 were reinforced concrete columns of the ordi-nary type, common in contemporary building were 10 feet long, having a No. 8 wire spiral, two %-inohcircular spacing rods, and four ^-inch square rods as reinforcement. Columns 9 and 10 were representative specimens of the cast-iron tubes as used for reinforcement in columns 1 and 2, etc. Theywere 6 inches outside diameter, 4^ inches inside diameter, and 10feet in length as received at the Bureau of Standards. Two-foot sections were cut from these columns as received andnumbered 9-a and 10-a. One unnumbered section of the samedimensions as 9-a and 10-a was received and tested. Columns 11 and 12 were identical in cross section with columns1 and 2, but were 10 feet long. Technologic Papers of the Bureau of Standards nftaffltt^ttia^^testsofeightee1919122tuck. 7
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