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January 14th, 1932. Dr. Herman Schlundt, University of Wissouri, Columbia, No. Dear Dr. Schlundt: With reference to the Wulf-lless electroscopic used by the Public Health Service, I may say I have never used this instrument personally. Upon receipt of your letter of January 8th, I took occasion to write Dr. Ives to make inquiry as to whether they had deternined the electrostatic capacity, as well as the voltage which corresponds to the scale readings, but Dr. Ives advises that they determined neither of these constants. Very truly yours, Vice President. HHBarker:RH