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MAR 131929
TREASURY DEPARTMENT
UNITED STATES
PUBLIC HEALTH SERVICE
OFFICE OF
INDUSTRIAL HYGIENE
WASHINGTON, D. C.
AND SANITATION
Room 1-123, "C" Bldg.,
16 Seventh St., S. W.
March 12, 1929
Mr. H. H. Barker,
Vice President,
United States Radium Corpn.,
535 Pearl St.,
New York, N. Y.
Dear Mr. Barker:
Thank you for your kind letter of March 1st.
Dr. Flinn recently wrote to Dr. Thompson in regard to
lending us the Wulf electroscope which he has been using
in New York. On receipt of your letter of March 1st
I sent him a copy of your letter, and he will probably
communicate with you.
I note what you say about lending us this instru-
ment, and also the one which you are importing, and I ap-
preciate your kind offer of help. We are going to order
a Wulf bifilar electroscope from Gunther and Tegetmeyer
but have not definitely decided what type we will get.
As you know, there is the original Wulf type and then
there is the Hess modification, and then there is a still
further modification by Kolhoester. Apparently the last
type which was designed for measuring the penetrating
radiation of the atmosphere is the most sensitive and reli-
able instrument. The Hess type is described in the
Physikalische Zeitschrift for 1913, page 1135, and the
Kolhoester type is described in the Zeitschrift fur
Physik for 1921, Band 5, page 107. As I understand it,
the type which you are using is the Hess type. Would
you kindly tell me what type instrument you have ordered
from Gunther and Tegetmeyer? Would you also tell me
--2--
what you think the best type would be for us to use? We
are ordering a Lind electroscope head and 4 large and one
small chambers for the same, and hope to begin to make
our preliminary tests very soon.
Yours very truly,
James E loves
(James E. Ives)
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"ocrText": "MAR 131929\nTREASURY DEPARTMENT\nUNITED STATES\nPUBLIC HEALTH SERVICE\nOFFICE OF\nINDUSTRIAL HYGIENE\nWASHINGTON, D. C.\nAND SANITATION\nRoom 1-123, \"C\" Bldg.,\n16 Seventh St., S. W.\nMarch 12, 1929\nMr. H. H. Barker,\nVice President,\nUnited States Radium Corpn.,\n535 Pearl St.,\nNew York, N. Y.\nDear Mr. Barker:\nThank you for your kind letter of March 1st.\nDr. Flinn recently wrote to Dr. Thompson in regard to\nlending us the Wulf electroscope which he has been using\nin New York. On receipt of your letter of March 1st\nI sent him a copy of your letter, and he will probably\ncommunicate with you.\nI note what you say about lending us this instru-\nment, and also the one which you are importing, and I ap-\npreciate your kind offer of help. We are going to order\na Wulf bifilar electroscope from Gunther and Tegetmeyer\nbut have not definitely decided what type we will get.\nAs you know, there is the original Wulf type and then\nthere is the Hess modification, and then there is a still\nfurther modification by Kolhoester. Apparently the last\ntype which was designed for measuring the penetrating\nradiation of the atmosphere is the most sensitive and reli-\nable instrument. The Hess type is described in the\nPhysikalische Zeitschrift for 1913, page 1135, and the\nKolhoester type is described in the Zeitschrift fur\nPhysik for 1921, Band 5, page 107. As I understand it,\nthe type which you are using is the Hess type. Would\nyou kindly tell me what type instrument you have ordered\nfrom Gunther and Tegetmeyer? Would you also tell me\n--2--\nwhat you think the best type would be for us to use? We\nare ordering a Lind electroscope head and 4 large and one\nsmall chambers for the same, and hope to begin to make\nour preliminary tests very soon.\nYours very truly,\nJames E loves\n(James E. Ives)"
}