['‘', 'and', 'oxides', 'of', 'nitrogen.', 'A', 'great', 'deal', 'of', 'effort', 'has', 'been', 'made', 'to', 'study', '(1-12)', 'these', 'materials', 'in', 'whole', 'smoke.', 'Our', 'experiments', 'eliminated', 'as', 'many', 'variables', 'as', 'possible', 'from', 'each', 'determination', 'so', 'that', 'any', 'promising', '.adsorbent', 'change', 'could', 'be', 'detected', 'and', 'optimized.', 'Adsorbents', 'developed', 'this', 'way', 'must', 'obviously', 'prove', 'themselves', 'in', 'whole', 'smoke', 'systems,', 'but', 'it', 'was', 'felt', 'that', 'baeic', 'information', 'should', '‘precede', 'attempts', 'to', '‘produce', '|', ',', 'desired', 'whole', 'smoke', 'ohatigen,', 'Accordingly,', 'eases:', 'were-used-singly,', '*', 'with', 'a', 'nitrogen', 'carrier.', 'gas.', 'Zest', 'constituent', 'cengentrations,', 'were:', 'APPEOXr', 'dmations', 'of-those:', 'found', 'in', 'cleareteay', '‘smoke', 'unless;', '‘higher:', 'concentrations', 'facilitated', 'the', 'experiments.', 'All', 'tests', 'were', 'made', 'at', 'ambient', 'temperature', 'and', 'pressure.', 'Variations', 'of', 'raw', 'material,', 'activity', 'level,', 'particle', 'size,', 'flow', 'rate,', 'and', 'others', 'were', 'made', 'successively', 'to', 'identify', 'charcoals', 'with', 'highest', 'efficiency.', 'We', 'then', 'attempted', 'to', 'increase', 'this', 'efficiency', 'through', 'the', 'changes', 'discussed.', 'Constant', 'charcoal', 'volumes', 'were', 'used', 'in', 'all', 'comparable', 'tests,', 'Except', 'as', 'specified,', 'all', 'charcoals', 'were', 'screened', 'to', 'an', '‘18', 'x', '20', 'U.*S;', 'mesh.', 'to', 'eliminate', 'mean', 'particle', 'diameter', 'variations.', 'EQUIPMENT', 'All', 'charcoals-were', 'tested', 'in', 'six', 'millimeter', 'inside', 'diameter.', 'vertical', 'glass', 'tubes.', 'with', 'force-fitted,', '80', 'U.', 'S.', 'mesh', 'wire', 'cloth', 'supports', 'for', 'the', 'charcoal', '|', 'granules.', 'Test', 'reproducibility', 'is', 'maintained', 'if', 'charcoals', 'are', 'sprinkled', 'slowly', 'into', 'the', 'tubes', 'until', 'the', 'desired', 'bed', 'depth', 'is', 'reached.', 'Beds', 'of', '10', 'and', '15', 'millimeter', 'depth', 'were', 'used', 'as', 'indicated.', 'For', 'istudies', 'on', 'acetaldehyde,', 'acrolein', 'and.', 'isoprene,', 'a', 'Model', '720', 'F', '&', 'M', 'Gas', 'Chromatograph', 'with', 'a', 'Model', '1609', 'Flame', 'Ionization', 'attachment', 'was', 'used.', 'This', 'instrument,', 'the', 'attendant', 'flow', 'meters', 'and', 'gas', 'bottles,', 'plus', 'a', 'sketch', 'LeLGZ27902']