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accurately weighed aluminum cylinder assembled impinger B. J. Sweo boric acid Bromoform Characteristic Dusts chemical method Chemistry Analytical Edition confining liquid control sample count cubic feet dessicator determination of free dust collecting systems dust particles DUST SAMPLES EXAMINED dust-laden air electrostatic precipitator enamel frit Engineering Chemistry Analytical Feldspar grinding ferric chloride FERRO ENAMEL CORPORATION filter paper fluoboric acid fluoric acid free silica content grams HAZARD LIMITS Industrial and Engineering INDUSTRIAL DUSTS insoluble residue kx log listed in Table method of sampling microns microns in diameter microscope Midget Impinger Mixing room number of milligrams number of particles particles less particles per cubic phosphoric acid platinum crucible primary areas procedure pump pure silica quartz red heat refractive indices room temperature routine method safety engineers secondary areas shows this sampler sili SILICA IN DUSTS silicosis hazard space heater specific gravity TECHNICAL BULLETIN twenty-hour period volume of air weight of dust weight of free