Jun 15 1968
From The Space Library
Rare photographic zenith tube, PZT, which provided almost exact measurement of astronomical time, had been installed at Dominion Observatory, Priddis, Alberta, Canada. It would be used in conjunction with another PZT at Royal Greenwich Observatory near Herstmonceux, U.K., to study continental drift by establishing exact measurements between two points on same latitude and observing whether distance changed with time. (Can Press, NYT, 6/15/68,20)
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