Jun 15 1968

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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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