[du Pont Letterhead]                       CC: Dr. J.E. Booge

E. I. DU PONT DE NEMOURS & COMPANY    This document contains information affecting the
                                      national defense of the United States within the
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                                               Newport, Delaware
                                               February 7, 1944
PIGMENTS DEPARTMENT

    CLASSIFIED-CONFIDENTIAL

DR. J. N. TULLY
NEWPORT

                            SILICON FOR CT-93

        The product from run RZ-66, made for CT-93, has been purified
and analyzed and may now be released.  A total of 11.4 pounds of the
purified material was obtained.  The description, quantity and analysis
are as follows:


        Code      Description     Quantity   Spectrographic Analysis
                                   Grams     Minor      Traces      
                                             Zn  Al  Mg Cu Fe Ti Mn  
        RTZ-66A   0-6"              172       -   -   3  2  -  1  -
        RTZ-66B   6"-36"            903       -   -   2  1  -  -  -
        RTZ-66C   6"-36" scales     187       -   -   3  1  -  -  -
        RTZ-66D   36"-72"          3461       -   -   1  3  -  -  -
        RTZ-66E   36"-72" scales    191       -   -   2  3  1  -  -
        RTZ-66F   Scales, large     292       -   1   2  3  1  -  -
                                   5206

        RTZ-66E and F quality is doubtful since four tests were neces-
sary before check results were obtained.  Different tests indicated
from relatively large amounts to the absence of iron in these two samples.

        As formerly decided, we shall exchange 2.33 pounds of RTZ-62
for an equal quantity of RTZ-66.  The former is relatively finely divided
and might prove difficult to handle in a melting operation.  For this
exchange we plan to use all of RTZ-66B and 154gm. of RTZ-66D.  This
material will enter the CT-112B account in the place of the following:

                                     Spectrographic Analysis     
        Code       Quantity Gms.     Minor        Traces        
                                     Zn  Al   Mg  Cu  Fe  Ti  Mn
        RTZ-62A        186            -   2    2   2   -   -   -
        RTZ-62B        456            2   -    2   2   -   -   -
        RTZ-62C        415            1   -    1   1   -   -   -