creator Karuhn, Richard F. creator Davies, Reg creator Clinch, John Michael Improved accuracy of size measurement and size distribution of particles in a fluid have been obtained in an electrical zone sensing apparatus by a flow control director means which directs the fluid in a more streamlined, less turbulent flow through an aperture at which the particles are electrically sensed. Also, the particles were directed and guided to flow substantially parallel to longitudinal axis for the aperture. The preferred flow control detector means comprises a contoured orifice having a smooth tapered inlet wall blended at an intersection with a central cylindrical wall defining a tubular shaped aperture. Submitted by Aric Ahrens (ahrens@iit.edu) on 2011-11-09T16:58:12Z No. of bitstreams: 1 3739258.pdf: 279889 bytes, checksum: 98eb7113d438d53e9dadb90c721595b3 (MD5) Made available in DSpace on 2011-11-09T16:58:12Z (GMT). No. of bitstreams: 1 3739258.pdf: 279889 bytes, checksum: 98eb7113d438d53e9dadb90c721595b3 (MD5) Previous issue date: 1973-06-12 IIT Research Institute 2009-04-30 1973-06-12 3,739,258 http://hdl.handle.net/10560/2303 en United States Patent Patent reformatted digital application/pdf No Copyright - United States http://rightsstatements.org/page/NoC-US/1.0/ Open Access