On February 7, 1991, the third technological report meeting by the engineers in the Institute for Nuclear Study, University of Tokyo, was held as a part of the study and training curriculum in the Institute for Nuclear Study. In the report meeting, three general reports and three reports of official overseas trips were carried out, and these are summarized in this book. It shows the activities of INS engineers in wide fields and the standpoint of engineers in a university research institute clearly. In addition, it seems effective for the interchange in the institute and the technological advance. Though the every day activities of the engineers are diverse, the general reports were only three, and it is a little regrettable. In April, 1990, a step was taken for establishing the system for engineers also in University of Tokyo, and for accelerating this move further to `special administration post`, the technological report meeting and the collection of reports like these have important significance. Three general reports are on NC milling machine, high frequency acceleration in TARN2, and making of CAMAC branch driver for multi-functional terminals in INS. (K.I.).