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Ronald L. Ives Indiana University, Bloomington, Ind.

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Unsatisfactory operation of “issue” interval annunciators for extended use in meteorological theodolite observations led to a series of experiments from which a highly satisfactory time interval unit was developed.

* Published by permission of Chief, Chemical Warfare Service, U. S. A.

Unsatisfactory operation of “issue” interval annunciators for extended use in meteorological theodolite observations led to a series of experiments from which a highly satisfactory time interval unit was developed.

* Published by permission of Chief, Chemical Warfare Service, U. S. A.

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