写在前面的话《航仪报导》是上海航海仪器厂的技术交流刊物,创刊至今已十六度春秋。她是我厂广大技术和管理人员进行技术、学术切磋的园地,也是我厂对外进行技术和经济信息交流的窗口。今后我们将经常借助此“专版”,肥我“园地”,扩我“窗口”。望各界读者朋友,多联系,多赐教。——《航仪报导》编辑部 In front of it, “Aerial Report” is a technical communication publication of Shanghai Navigation Instrument Factory. It has been published for 16 years. She is the site of technical and managerial personnel of our factory for technical and academic discussions. It is also a window for the exchange of technical and economic information with us. In the future, we will often use this “special edition” to make me “land” and expand my “window.” Hope readers from all walks of life, more contact, more enlighten me. - Editorial Department of “Aerial Report”