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UNIVERSITY OF MISSOURI
COLUMBIA
DEPARTMENT OF CHEMISTRY
MAY 7 1930
Jun
May 5, 1930
Mr. H. H. Barker
U. S. Radium Corporation
535 Pearl St.
New York City, N.Y.
Dear Mr. Barker:
With reference to the Welsbach stock
of Mesothorium in process, let me say that this is
steadily declining and will probably be exhausted
within the next year. You may have heard that the
Welsbach Company has decided to discontinue the
manufacture of Thorium Nitrate. When the present
stock of Monazite sand is worked up this division
of their work will be discontinued. In fact, it
has been closed already. Within another year the
accumulated residues and materials in process will
doubtless be finished up. Last year we refined
about 800 mg. and this year we shall refine by
July lst about 600 mg.
All of the aged material has been
disposed of, but I do not know whether the 800 mg.
which we refined last year was also included in the
sale.
Dr. Breckenridge and an assistant
have begun processing the zinc residues. They did
not get started as quickly as they had hoped be-
cause they made two or three duplicate runs on some
batches before undertaking operations on a more
extended scale, but they are now operating with
a large kettle and the work should go forward quite
rapidly from now on. They are not ready as yet to
start a crystallizing system. Dr. Breckenridge
was pleased to hear however that the next lot of
material would be coming along soon.
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"ocrText": "UNIVERSITY OF MISSOURI\nCOLUMBIA\nDEPARTMENT OF CHEMISTRY\nMAY 7 1930\nJun\nMay 5, 1930\nMr. H. H. Barker\nU. S. Radium Corporation\n535 Pearl St.\nNew York City, N.Y.\nDear Mr. Barker:\nWith reference to the Welsbach stock\nof Mesothorium in process, let me say that this is\nsteadily declining and will probably be exhausted\nwithin the next year. You may have heard that the\nWelsbach Company has decided to discontinue the\nmanufacture of Thorium Nitrate. When the present\nstock of Monazite sand is worked up this division\nof their work will be discontinued. In fact, it\nhas been closed already. Within another year the\naccumulated residues and materials in process will\ndoubtless be finished up. Last year we refined\nabout 800 mg. and this year we shall refine by\nJuly lst about 600 mg.\nAll of the aged material has been\ndisposed of, but I do not know whether the 800 mg.\nwhich we refined last year was also included in the\nsale.\nDr. Breckenridge and an assistant\nhave begun processing the zinc residues. They did\nnot get started as quickly as they had hoped be-\ncause they made two or three duplicate runs on some\nbatches before undertaking operations on a more\nextended scale, but they are now operating with\na large kettle and the work should go forward quite\nrapidly from now on. They are not ready as yet to\nstart a crystallizing system. Dr. Breckenridge\nwas pleased to hear however that the next lot of\nmaterial would be coming along soon."
}