“…Nuclear absorption (Price et al, 1976;Prezewlocki and Nizegarodcew, 1973;O'Fallon et al, 1976), electrical conductivity (Babh and Etkin, 1974;Merilo et al, 1977), electrostatic transfer (Soo and Cheng, 1970; King, 1973), light absorption (Litchfield, 1977;Soo et al, 1964), Coriolis force (Micro Motion Inc., 1978), and acoustic absorption (Epstein and Garhart, 1968; Raptis et al, 1976) have all been proposed or tested. Argonne National Laboratory is now performing an extensive study to develop instrumentation and process control for fossil demonstration plants (LeSage and O'Fallon, 1977). Part of this study deals with the measurement of coal/gas flow rates.…”