The introduction of the Varian A-60 NMR spectrometer in 1961 made possible the routine utilization of this tremendously important technique in many laboratories. At that time there were, however, a number of difficulties with both the A-60 and the NMR technique itself. The major instrumental developments which have been made in an effort to solve these problems are discussed in this review. A tabulation of the characteristics of the presently available commercial instruments is given.
Roy H. Bible, "NMR Instrumentation since the Varian A-60," Appl. Spectrosc. 24, 326-332 (1970)