Dr. Irving Langmuir:
Referring to your letter of December 16th, in reference to bill 10911, for $6.00 covering 6 lbs. of colorite consumed for your personal account. This covers the cost of the colorite metal.
We previously rendered you bill M-10437 covering charge to us from the Coe Brass Company for making of the wire, $7.50, and bill F-5337 for freight – $.35. These charges $13.85 in all, cover the entire charge for 6 lbs. of colorite wire bought by you.
W. S. O’Brien
Per – F. S. Way