The analysis of the coals performed from both NMR and ESR data revealed several interesting results. First, adequate signal levels for flow metering can be obtained from all coals with either the hydrogen nuclear magnetic resonance or the electron spin resonance. However, the higher signal/noise ratio of ESR makes it more advantageous than the NMR for use in measuring the flow rate, although either or both could be used. Second, the ESR amplitude is highly correlated with the amount of carbon in the coal and with the ratio of the carbon to volatiles. Third, hydrogen NMR can be used to separately measure both the volatiles and the water content of the coal. In summary, the conceptual design of the flowmeter is as originally proposed based on the use of a spin filter oscillator, which derives ESR signals from the free radicals in coal. The results of the ESR and NMR measurements and information from the literature as well as on the prior experience of SwRI in the development of applied magnetic resonance devices confirmed the basic feasibility of this approach. These signals were found to be of useful intensity throughout the entire set of domestic coals. In the proposed configuration, the flowmeter will measure the flow velocity by sensing the frequency shift in the spin filter oscillator. The concentration of the coal (and the carbon) in the flow stream will be sensed as a function of the ESR amplitude. NMR techniques will be used to simultaneously measure the moisture and volatiles contents of the coal. The heating value of the coal will be estimated by use of both ESR and NMR measurements.