MASSACHUSETTS INSTITUTE OF TECHGNOLOGY Research Laboratory of Electronics Quarterly Progress Report April 15, 1947 Submitted by: J A J A Stratton G Hill B Wiesner 0 Introduction This report is the fifth of a series of quarterly progress reports issued by the Researcn Laboratory of Electronics of the Laboratory during the period and contains a review of the activities January 1 1947 through March 31 1947 In accordance with a recent dec 4 sion of the Services Technical Advisory Committee brief summaries of status are given for cost of the projects discussions for the remaining ones The groups reporting in and more expanded more detail are Low Temperature Resear,.h (Magnetic Nuclear Resonance Experiments Ultrasonics Research Section IIIB, Section IID5) Communications and Related Projects Sec- tion IV Tne seventh M I T pre-war years Profes or W Physical Electronics Conference, an annual event in was held on March 27 B Nottingham of the Physics Department very actively and 29 under the general direction of While this Conference is primarily the responsibility the Research Laboratory of Electronics participated Visitors from all parts of the United States and representatives from Canada and England were present the fields of 28 The free exchange of ideas by worzers in principally photoelectric emission thermionic emission secondary emission and gas discharge phenomena assured the success of the Conference and demonstrated a general desire for its re-establishment as an annual event