| Show NEW DUST SAMPLING instrument the bureau of mines and the public health service cognizant of the importance of dust in the causation of pulmonary disease have conducted numerous studies on the and nature of dustin dust in mine and factory air A new instrument for sampling aerial dust devised by leonard freeburg Gre eburg Z assistant sanitary engineer retired united states public health service and d lid george T smith junior physical chemist heni bureau of mines makes use of the principle of impingement of the dust laden air at high velocity on oil a wetted glass surface together with that of bubbling the air through a liquid medium this apparatus consists essentially of three parts a hand pump or electrically tri cally driven blower a flow meter or other suitable means of measuring the air passed through the instrument and the dust collecting za device this new dust sampling 6 instrument is described in serial 2392 which may be obtained from the bureau of mines washington D C |
