附录五
我们已经指出，吉丁斯和刘易斯公司的数字记录系统采用了一种离线“指挥仪”，用于插值打孔带数据，并将这些数据转移成磁带上的相位模拟信号。这种系统当时还在使用通用电气公司的记录一回放控制系统。邦迪克斯公司的加尔文·约翰逊等人研制的“指挥通路”系统实际在麻省理工学院的控制系统上加以改进，并使用了晶体管。它是一种全部的数字化设计，由打孔带输入，并在机器上插值，不需要转换成模拟信号或磁带介质。
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\* Harry Ankeney, “The Numericord System,” Glenn R. Petersen, “General Electric Numerical Contouring Control," and Murray Kanes, “Bendix Tape Control System," all in Proceedings of the EIA Symposium; Jack Rosenberg, “Digimatic Control System: Technical Description," Proceedings of the EIA Symposium; Rosenberg,“A History of Numerical Control";1957 年 5 月 15 日 John Dutcher 致 William M. Stocker, (courtesy John Dutcher); J. M. Morgan, “The Cincinnati System,” Proceedings of the EIA Symposium; 1957 年 5 月 15 日 John Dutcher 致 William M. Stocker; North American Aviation Corporation, “NUMILL," brochure, N/C Project Files; John L. Bower, “The NUMILL," in Proceedings of the EIA Symposium; see also Peter J, Farmer, “Analogue Control, Application of EMI Control System to a Standard Vertical Milling Machine," Aircra ft Production (London)(April 1956), pp. 126—134; Peter J. Farmer, “Fairey-Ferranti," Aircraft Production, May 1958, p. 174; “Co-ordinate Control Of Machine Tools," Engineering (London), June II, 1954。
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