Letters Sent to Dr. F.B. Flinn [Dr. Frederick B. Flinn], November 11, 1925
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OCR Page 1 of 2Nov 12
Copy to New York Office.
ZTATES
350 Main Street, Orange, N. J.
November 11, 1925.
Dr. F. B. Flinn,
437 West 59th Street,
Columbia University,
New York City.
Dear Dr. Flinn:
The sample of activatated zine sulphide submitted by you for
analysis contzains 0.0549 milligrams of radium element or its
equivalent when measured by its gamma radiation. This figures
the same a.8 material which contains 2.90 ng of radium element
or its equivalent per 100 grams.
Very truly yours,
H. H. Barker.
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