“…Otherwise, it would have been impracticable to reconstruct the scientific and philosophical development (good or bad) of the quantities, units, and measurement systems needed to use and control ionizing radiations . primary objectives, 154 statement of ABR (1947), 163 diplomates, classes of, 163 columnar ionization, 171 measurement by extrapolation, 172 Foote, P.D. , 25, 28 free air chamber, gamma rays (NPL), 47 Fricke, H. , 18 outline of measurement problems (1926), 18 124 x-ray tubes, 189 constant potential (1940), 1400 kV, [190][191] auxiliary sources, 191 high-voltage laboratory, 190 transformers, 190 voltage measurement, 125,191 x-ray tubes, 190 Vil lard rectifier (1930), 300 kV, 187 Hoover, H., (Sec'y.…”