Measurements were made of the transmission of liquid para-and normal hydrogen for the slow neutrons obtained from a Rn-Be source by scattering in paraffin. In some of the experiments the paraffin was at room temperatures and in others it was cooled with liquid air. Teller, and Schwinger and Teller, have shown how the spin dependence of the interaction between neutrons and protons can be investigated by such measurements. As the neutrons captured by the protons were less than 1 percent of the scattered neutrons, the scattering by the thin layers of liquid hydrogen used was determined from the transmission measurements. The scattering cross section of liquid hydrogen for slow neutrons was found to depend upon the velocity of the neutrons and on the ortho-para composition of the hydrogen. The following values were obtained for the neutron scattering cross sections,

The continuing education of engineering professionals has been an important objective of the University of Pittsburgh's Manufacturing Systems Engineering Program (MSEP) since its inception in 1987. Making relevant graduate-level programs accessible to the population of engineering professionals separated from traditional university communities has been the object of much effort for more than three decades. The distance education tool of interactive video teleconferencing over the public telephone network has recently become a viable method for extending the university environment to these remote students. This paper considers the context and analysis of student reactions and attitudes toward MSEP graduate-level courses delivered to the University's regional campus at Johnstown, Pennsylvania. Since the fall of 1994, MSEP has offered these courses using offthe-shelf interactive video teleconferencing systems over the public switched digital network. Issues that may affect the perceived quality of these programs (e.g., in the areas of audio communication quality, instructional strategies, course materials distribution, and course offerings) are identified and discussed.

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