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Published online by Cambridge University Press: 27 June 2016
Automatic operation of the PZT located at the U.S. Naval Observatory Time Service Substation, Richmond, Florida was initiated February 1, 1970. A comparison of one year's automatic operation with the previous year's operation has shown a significant increase in the number of time and latitude sights obtained.
Based on an improved ventilating system within the PZT, the probable error of a single night's observation has been reduced.