amount of smoke would have corresponded to 100-800 ppm SO2 (5-40% of chart)-even more if the mean particle size were submicron-since the mean wavelength of the opacity monitor was much larger than that of the SO2 instrument. CONCLUSIONThe present instrument concept appears well suited to in-situ measurement. Its embodiment as an SO2 analyzer is reasonably accurate and stable, even without continual on-line zero and range checks. Freedom from particulate interference is both a theoretical and practical reality. Compensation for aging of both phototubes and both lamps is also provided. Accuracy seems to be within the precision of corroborating measurements provided account is taken of residual long-term calibration drift, which amounts to perhaps 5% in three weeks. ACKNOWLEDGMENTThe authors are indebted to their then immediate supervisors, . P. Markant of B&W Research and R. A. Murzyn of Bailey Meter Company, for continued encouragement and support. Our field test program could not have been successful without the generous cooperation of R. S. Bau-man
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