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to 40% radium. From about 1919 until 1925 our average mixture of the
two substances would run to 90% mesothorium to 10 redium. Previous
to 1919 we used 100% radium.
Now here is another fact which modifies
the figures somewhat, and that is - that mesothorium contains from 20 to
25% radium, so when we speak of a combination of 80% mesothorium and
20% radium you are actually using approximately 60% mesotherium and 40%
radium. We have never used any radio-active substances in our luminous
material except these two, since the other known substances are inefficent
and too short lived.
As regards the application work on the Alden Watches, which we:
are doing for you - The plant Manager is not available until late this
afternoon and I shall then check the adhesive methods of application,etc.
and write you when I have this information at hand.
Very truly yours,
President.
CBLee:RH
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"ocrText": "-2-\nto 40% radium. From about 1919 until 1925 our average mixture of the\ntwo substances would run to 90% mesothorium to 10 redium. Previous\nto 1919 we used 100% radium.\nNow here is another fact which modifies\nthe figures somewhat, and that is - that mesothorium contains from 20 to\n25% radium, so when we speak of a combination of 80% mesothorium and\n20% radium you are actually using approximately 60% mesotherium and 40%\nradium. We have never used any radio-active substances in our luminous\nmaterial except these two, since the other known substances are inefficent\nand too short lived.\nAs regards the application work on the Alden Watches, which we:\nare doing for you - The plant Manager is not available until late this\nafternoon and I shall then check the adhesive methods of application,etc.\nand write you when I have this information at hand.\nVery truly yours,\nPresident.\nCBLee:RH"
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